Add mock server suite base

[congqixia]

See also #410 #411

/kind improvement

Signed-off-by: Congqi Xia congqi.xia@zilliz.com

[codecov]

Codecov Report

Merging #412 (df2666b) into master (f5d28d7) will increase coverage by 3.57%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
+ Coverage   83.40%   86.98%   +3.57%     
==========================================
  Files          30       29       -1     
  Lines        3049     2735     -314     
==========================================
- Hits         2543     2379     -164     
+ Misses        413      269     -144     
+ Partials       93       87       -6     

Impacted Files	Coverage Δ
client/client_grpc_collection.go	85.99% <ø> (ø)
client/client_grpc_data.go	72.32% <ø> (ø)
client/client_grpc_options.go	78.26% <ø> (ø)
client/client_grpc_partition.go	82.67% <ø> (ø)
client/client_grpc_row.go	83.48% <ø> (ø)
client/errors.go	50.00% <ø> (ø)
client/client_mock_test.go

[jiaoew1991]

/lgtm

[sre-ci-robot]

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