support for broker layer asynchronous transports (#677)

[iwannay]

Support for asynchronous transfer like Nginx, which can be transmitted to the opposite side after the broker layer fully receives the data

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[codecov-io]

Codecov Report

Merging #680 (b844255) into develop (e76d8a3) will increase coverage by 0.14%. The diff coverage is 62.93%.

@@             Coverage Diff             @@
##           develop     #680      +/-   ##
===========================================
+ Coverage    52.21%   52.36%   +0.14%     
===========================================
  Files          288      289       +1     
  Lines        22355    22587     +232     
===========================================
+ Hits         11673    11828     +155     
- Misses        9084     9147      +63     
- Partials      1598     1612      +14     

Impacted Files	Coverage Δ
bfe_server/proxy_state.go	0.00% <ø> (ø)
bfe_server/reverseproxy.go	0.00% <0.00%> (ø)
bfe_util/multibuf/buffer.go	78.04% <78.04%> (ø)
...bfe_cluster_conf/cluster_conf/cluster_conf_load.go	56.42% <100.00%> (+3.92%)	:arrow_up:
bfe_spdy/frame_write.go	46.32% <0.00%> (+1.12%)	:arrow_up:
bfe_spdy/server_write_sched.go	77.47% <0.00%> (+1.80%)	:arrow_up:
bfe_websocket/server_conn.go	74.59% <0.00%> (+4.09%)	:arrow_up:

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[iwannay]

#677

[iwannay]

my package is organized a little bit differently than the BFE, in the BFE different types of packages are enclosed in parentheses but mine are not, and that might be a problem 😂