Rearrange packages of go-micro adapter and test cases

[sczyh30]

Signed-off-by: Eric Zhao [email protected]

Describe what this PR does / why we need it

Rearrange packages of go-micro adapter and test cases

Does this pull request fix one issue?

NONE

Describe how you did it

• Package renamed to micro
• Move protoc files to tests directory.

Describe how to verify it

Run all test cases for regression.

Special notes for reviews

NONE

[codecov-commenter]

Codecov Report

Merging #219 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #219   +/-   ##
=======================================
  Coverage   42.54%   42.54%           
=======================================
  Files          85       85           
  Lines        4518     4518           
=======================================
  Hits         1922     1922           
  Misses       2353     2353           
  Partials      243      243           

Impacted Files	Coverage Δ
adapter/micro/client.go	46.34% <ø> (ø)
adapter/micro/options.go	37.93% <ø> (ø)
adapter/micro/server.go	41.02% <ø> (ø)

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