Feat auth supported for clients

[gutan]

proxy supported AUTH cmd for clients

[codecov-io]

Codecov Report

Merging #111 into master will decrease coverage by 0.19%. The diff coverage is 44.64%.

@@            Coverage Diff            @@
##           master     #111     +/-   ##
=========================================
- Coverage   49.47%   49.27%   -0.2%     
=========================================
  Files          62       62             
  Lines        6280     6307     +27     
=========================================
+ Hits         3107     3108      +1     
- Misses       2826     2849     +23     
- Partials      347      350      +3

Impacted Files	Coverage Δ
proxy/config.go	25% <ø> (ø)	:arrow_up:
proxy/proxy.go	0% <0%> (ø)	:arrow_up:
proxy/handler.go	0% <0%> (ø)	:arrow_up:
proxy/proto/redis/request.go	47.05% <0%> (-2.33%)	:arrow_down:
proxy/proto/redis/cluster/proxy_conn.go	60.6% <0%> (ø)	:arrow_up:
proxy/proto/redis/proxy_conn.go	72.63% <54.34%> (-8.81%)	:arrow_down:
proxy/proto/pipe.go	82.64% <0%> (-0.83%)	:arrow_down:

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