Add Open Liberty Generator

[brenthdaniel]

Two pieces here:

1. Add a generator for Open Liberty that extends the java-exec generator. It defaults webPort to the Liberty default port (9080) and adds an environment variable for use by S2I if it detects a Liberty runnable jar.
2. Add Liberty's default web ports (9080, 9443) to the ExposeEnricher so that routes get generated.

[rohanKanojia]

Thanks a lot for this PR 👍

Could you please add unit test for OpenLibertyGenerator and a sample project/integration test for this as well? Also, would be super awesome if we can add it to our website documentation (docs/ folder)

[rohanKanojia]

nit, indentation slightly off here

[brenthdaniel]

@rohanKanojia Sure, I didn't add unit tests initially because I didn't see them for most other generators. I added a couple of simple tests and documentation in the latest commit. I can add a more in depth sample later.

[rohanKanojia]

@brenthdaniel : cool, thanks. Looking forward to getting this merged 😄

[codecov]

Codecov Report

Merging #1711 into master will increase coverage by 0.19%.
The diff coverage is 70.17%.

@@             Coverage Diff              @@
##             master    #1711      +/-   ##
============================================
+ Coverage     33.98%   34.18%   +0.19%     
- Complexity     1105     1112       +7     
============================================
  Files           189      190       +1     
  Lines         10713    10769      +56     
  Branches       1745     1752       +7     
============================================
+ Hits           3641     3681      +40     
- Misses         6650     6661      +11     
- Partials        422      427       +5

[brenthdaniel]

@rohanKanojia Hi, is there anything else needed for this PR?

[rohanKanojia]

@brenthdaniel : just a tiny entry to changelog about this new feature 😄