New feature: New API to add or update micro-service dependency.

[little-cui]

No description provided.

[coveralls]

Coverage increased (+1.6%) to 71.899% when pulling c403962 on little-cui:master into 0f3a8d4 on ServiceComb:master.

[codecov-io]

Codecov Report

Merging #196 into master will increase coverage by 1.4%.
The diff coverage is 55.88%.

@@            Coverage Diff            @@
##           master     #196     +/-   ##
=========================================
+ Coverage   66.86%   68.27%   +1.4%     
=========================================
  Files          17       17             
  Lines        3498     3521     +23     
=========================================
+ Hits         2339     2404     +65     
+ Misses       1000      955     -45     
- Partials      159      162      +3

Impacted Files	Coverage Δ
server/service/microservices.go	73.03% <100%> (ø)	⬆️
server/service/util/microservice_util.go	77.59% <100%> (ø)	⬆️
server/service/util/dependency.go	50.13% <40%> (+5.83%)	⬆️
server/service/service_dependency.go	76.52% <90%> (+8.72%)	⬆️
server/service/instances.go	71.21% <0%> (+0.16%)	⬆️

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[coveralls]

Coverage increased (+1.6%) to 71.899% when pulling 495d6d8 on little-cui:master into 0f3a8d4 on ServiceComb:master.