[EPIC] Add regression/functional tests for booster projects

[hrishin]

At present, there is no regression test exist to verify the deployment of booster/starter applications [1] [2] on Kubernetes and OpenShift environment.
Any release or PR can go through a regression test for plugin project that can make sure application deployment is functioning well.

Applications to deploy:
[1] VertX
[2] Springboot

The broader idea is to have regression test suit that can run on PR submission of plugin, kubernetes-client and kubernetes-model projects to test the deployment of booster applications[1][2]

Tasks:

• Identify the testing framework/tools for to implement the test by implementing simple deployment test
• Prepare test cases
• Implements tests
• Scripts to prepare test environment
• CI/CD integration if applicable
• Update the documentation if applicable

[hrishin]

@rohanKanojia @piyush1594
Lets evaluate https://github.com/fabric8io/fabric8/tree/master/components/kubernetes-assertions for assertions

[hrishin]

To run these regression tests, first, we need to bring test environment in place

1. Running OpenShift (minishift) environment or Mock server (as per meeting discussion)
2. Script to bring this[1] environment on CI/CD instances
   To begin with the basic implementation, we would like to run the test against minishift then eventually substitute minishift with good mocking sever implementation.

@jstrachan @rohanKanojia @piyush1594 @rhuss WDYT?

[hrishin]

With the first run of regression tests, we need to fix the following issues

• Test behavior on Travis environment is intermittent. Sometimes tests are getting failed with some errors in f8-m-p like build timeout for OpenShift build service #1133 Prepare regression test environment on CI server #1113 or may be issue with test infrastructure
• On an average CI job for test taking more than 20 minutes, travis log
• Fixed the build issue for OpenShift v3.7 application redeployment is getting failed for OpenShift v3.7.0 #1130 as its affecting overall test behavior and performance as well

[piyush-garg]

@hrishin Can we close this now

[piyush-garg]

As #1198 is closed by #1199 and #1130 is also closed, I am merging this.