cluster and identity_cluster tables

[alexeykazakov]

• More common usage (json_api and rest packages)
• cluster and identity_cluster tables as the first part of Endpoint to get clusters available to particular user #15

Fixes #9

[codecov]

Codecov Report

Merging #24 into master will increase coverage by 12.92%.
The diff coverage is 95.83%.

@@           Coverage Diff            @@
##           master   #24       +/-   ##
========================================
+ Coverage   67.07%   80%   +12.92%     
========================================
  Files          12     6        -6     
  Lines         814   480      -334     
========================================
- Hits          546   384      -162     
+ Misses        231    79      -152     
+ Partials       37    17       -20

Impacted Files	Coverage Δ
controller/clusters.go	100% <100%> (ø)	⬆️
configuration/configuration.go	76.68% <100%> (ø)	⬆️
migration/migration.go	80% <88.88%> (+39.5%)	⬆️

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[xcoulon]

Looks good overall, and it's always great to see more common pkgs being consumed 🎉
I just provided you with a few minor comments that could be addressed later.

[xcoulon]

there's already a sentry pkg in https://github.com/fabric8-services/fabric8-common/tree/master/sentry, so what about removing this local pkg instead ?

[alexeykazakov]

The cluster sentry thing provides userInfo function implementation (and tests for that). The common sentry doesn't have this function. Main reason for that is Token Manager loaded from context. We should implement the default userInfo function in common which will use the token manager from common. But clients still have to be able to use their own userinfo function in case they use their own token manager. Like Auth service.

[xcoulon]

what about removing this file in favor of https://github.com/fabric8-services/fabric8-cluster/tree/master/test/suite ?

[alexeykazakov]

I guess you mean github.com/fabric8-services/fabric8-common/test/suite ?
This suite extends the common suite. Just adds cluster configuration initialization on top to that.