LPS-36412 Reading patch.level to identify what fix packs had been instal...

Hi Brian,

This new API would help us what fix packs are available and installed. When hotfix-1234 contains core-5, web-content-1 and one extra LPE, only the hotfix-1234 would be installed by the patching-tool while all of the core-5 and web-content-1 fixes would be available.

The patcher APIs would return the following values in this scenario:
getInstalledPatches(): hotfix-1234
getFixedIssues(): LPE-123,LPE-124,LPE...
getPatchLevel():core-5,web-content-1,hotfix-1234