Add ability to create clusters with specific replica groups

[mattsta]

This allows cluster setup with explicit master->replica mappings as defined in a cluster description file.

Runnable with: redis-trib.rb create-by-file cluster.yaml

Also fixes redis-trib color console printing. Also adds color to more error/status messages. Also removes some ruby warnings. Also lets trib resolve node hostnames during creation. Also improves node printing during cluster bring-up (still prints old output, but prints new version too).

Cluster Runtime Description Before

M: eff0a5a1ab4c88ec5ac82c7ad2454f29cacc2658 127.0.0.1:7000
   slots:0-2047 (2048 slots) master
   3 additional replica(s)
M: 877172731246edc7f2dbe41eaf8ba20e6ea372cb 127.0.0.1:7001
   slots:2048-4095 (2048 slots) master
   3 additional replica(s)
M: a41fc5a04acc26cb810c8e0acfe97a45bfe4c15a 127.0.0.1:7002
   slots:4096-6143 (2048 slots) master
   3 additional replica(s)
M: dfca5a55f5648ae6ada1b84c8dbba03edb781676 127.0.0.1:7003
   slots:6144-8191 (2048 slots) master
   3 additional replica(s)
M: 47c050cfb5c1640f978ec679b4ae9efaa1523d72 127.0.0.1:7004
   slots:8192-10239 (2048 slots) master
   3 additional replica(s)
M: 75e45bdc38fe06d14e8cef1cf22b6fc623c5d5a8 127.0.0.1:7005
   slots:10240-12287 (2048 slots) master
   3 additional replica(s)
M: 33c47662dd44d1ba1f8f223d69c325abfe0e8f45 127.0.0.1:7006
   slots:12288-14335 (2048 slots) master
   3 additional replica(s)
M: 65a713bde85e21827c0b6650eb8f33ef96c01985 127.0.0.1:7007
   slots:14336-16383 (2048 slots) master
   3 additional replica(s)
S: 585c0512857e97386a65f4b9ffd0124baf0d76f4 127.0.0.1:7008
   replicates eff0a5a1ab4c88ec5ac82c7ad2454f29cacc2658
S: 807319fbf8b5141252a9e689905cd0da951f953e 127.0.0.1:7009
   replicates eff0a5a1ab4c88ec5ac82c7ad2454f29cacc2658
S: 4501c5f9ecb11946c188f4d78c39cf4220975889 127.0.0.1:7010
   replicates eff0a5a1ab4c88ec5ac82c7ad2454f29cacc2658
S: 442f990cdc7a8d29a90b89ed837c72d2193f0ec3 127.0.0.1:7011
   replicates 877172731246edc7f2dbe41eaf8ba20e6ea372cb
S: e988042cde1b06b96a6300095a4912cbb16461e4 127.0.0.1:7012
   replicates 877172731246edc7f2dbe41eaf8ba20e6ea372cb
S: 2bd0c954448b536cd33f9c85b3e1f4e2357ca29d 127.0.0.1:7013
   replicates 877172731246edc7f2dbe41eaf8ba20e6ea372cb
S: 69c7a059db580d945c2dd55a4a93490785d39679 127.0.0.1:7014
   replicates a41fc5a04acc26cb810c8e0acfe97a45bfe4c15a
S: 54f92d1f7c832c5dc160028a8a3c8317b3dd2f75 127.0.0.1:7015
   replicates a41fc5a04acc26cb810c8e0acfe97a45bfe4c15a
S: 85b2f191b79338c59c17337c5f37580680f2efca 127.0.0.1:7016
   replicates a41fc5a04acc26cb810c8e0acfe97a45bfe4c15a
S: 847b61222c3c7934b0c10015968a54d9c2a62938 127.0.0.1:7017
   replicates dfca5a55f5648ae6ada1b84c8dbba03edb781676
S: 145f793e5c666e27172f96aa35a9624575b408b3 127.0.0.1:7018
   replicates dfca5a55f5648ae6ada1b84c8dbba03edb781676
S: ba8c4144d3b18dc608f680a52092ad208dfa1911 127.0.0.1:7019
   replicates dfca5a55f5648ae6ada1b84c8dbba03edb781676
S: f5973d4895bf62c8911fca2b72431da460d19247 127.0.0.1:7020
   replicates 47c050cfb5c1640f978ec679b4ae9efaa1523d72
S: b912afc49eaee3428d67e75ff043a0f83c35cb96 127.0.0.1:7021
   replicates 47c050cfb5c1640f978ec679b4ae9efaa1523d72
S: 3d52805418349fd9515483f7de35fa21f4ea9be1 127.0.0.1:7022
   replicates 47c050cfb5c1640f978ec679b4ae9efaa1523d72
S: 19306285b525dc70433be07845b5c33f94ff29d2 127.0.0.1:7023
   replicates 75e45bdc38fe06d14e8cef1cf22b6fc623c5d5a8
S: 216cd1d90a6e302ef61c4f46b6580380da1a876d 127.0.0.1:7024
   replicates 75e45bdc38fe06d14e8cef1cf22b6fc623c5d5a8
S: e693dd85787cebdb7f2732f170795e59c746c770 127.0.0.1:7025
   replicates 75e45bdc38fe06d14e8cef1cf22b6fc623c5d5a8
S: 674f92b784dc62fee42821dbe32bf21189385664 127.0.0.1:7026
   replicates 33c47662dd44d1ba1f8f223d69c325abfe0e8f45
S: b27657df429698960960062d6e7a080cf88de173 127.0.0.1:7027
   replicates 33c47662dd44d1ba1f8f223d69c325abfe0e8f45
S: f056df2e2c225ab8463d98ceb36b5a194937135f 127.0.0.1:7028
   replicates 33c47662dd44d1ba1f8f223d69c325abfe0e8f45
S: 8dd0a934accec4beb1e2870ac3b93eaf6b576bee 127.0.0.1:7029
   replicates 65a713bde85e21827c0b6650eb8f33ef96c01985
S: 4466a813653100eaa2503b91a3411db9a7deafa8 127.0.0.1:7030
   replicates 65a713bde85e21827c0b6650eb8f33ef96c01985
S: 1e42d346e29ce010b26b4b9a53acb38ae9264d7c 127.0.0.1:7031
   replicates 65a713bde85e21827c0b6650eb8f33ef96c01985

Cluster Runtime Description After

Printing human readable map of cluster topology...
Group for hash slots 0-2047 (4 nodes):
    127.0.0.1:7000 (master)
    127.0.0.1:7008 (replica)
    127.0.0.1:7009 (replica)
    127.0.0.1:7010 (replica)
Group for hash slots 2048-4095 (4 nodes):
    127.0.0.1:7001 (master)
    127.0.0.1:7011 (replica)
    127.0.0.1:7012 (replica)
    127.0.0.1:7013 (replica)
Group for hash slots 4096-6143 (4 nodes):
    127.0.0.1:7002 (master)
    127.0.0.1:7014 (replica)
    127.0.0.1:7015 (replica)
    127.0.0.1:7016 (replica)
Group for hash slots 6144-8191 (4 nodes):
    127.0.0.1:7003 (master)
    127.0.0.1:7017 (replica)
    127.0.0.1:7018 (replica)
    127.0.0.1:7019 (replica)
Group for hash slots 8192-10239 (4 nodes):
    127.0.0.1:7004 (master)
    127.0.0.1:7020 (replica)
    127.0.0.1:7021 (replica)
    127.0.0.1:7022 (replica)
Group for hash slots 10240-12287 (4 nodes):
    127.0.0.1:7005 (master)
    127.0.0.1:7023 (replica)
    127.0.0.1:7024 (replica)
    127.0.0.1:7025 (replica)
Group for hash slots 12288-14335 (4 nodes):
    127.0.0.1:7006 (master)
    127.0.0.1:7026 (replica)
    127.0.0.1:7027 (replica)
    127.0.0.1:7028 (replica)
Group for hash slots 14336-16383 (4 nodes):
    127.0.0.1:7007 (master)
    127.0.0.1:7029 (replica)
    127.0.0.1:7030 (replica)
    127.0.0.1:7031 (replica)

[badboy]

This includes some good changes, that should be included nonetheless.

But we should also rethink the "cluster description file" approach (whether we end up with yaml, json, an ini-like format or a custom format after all). I think it's worthwhile to have this

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
0 out of 2 committers have signed the CLA.

:x: mattsta
:x: MasahikoSawada
_{You have signed the CLA already but the status is still pending? Let us recheck it.}