Refactoring CompanionAdTestCase.java
##Rationale
It was suggested that my next move be to refactor **CompanionAdTestCase.java**, as, while it did work correctly, it was a little clunky and difficult to read and as someone who is still a beginner, learning to refactor code is an important skill.
##Changed Files
**OnceUxUiAutomatorBase.java**
* Changed *msecToPreroll* to 8000 to allow for less fails when the video takes too long to load.
**CompanionAdTestCase.java**
* Consolidated *testCompanionAd* and *testCompanionAdVanish* into one test
  * moved asserts to utility methods waitForCompanionAdCheck and waitForEndOfAdCheck
  * changed name of *testCompanionAd* to *testCompanionAdPresence*
  * removed *testCompanionAdVanish*
* Removed if-else statements from utility methods
* Changed *waitForCompanionAdCheck* and *waitForEndOfAdCheck* from booleans to voids
* Updated javadoc comments
* removed extraneous imports
Merge pull request #63 from BrightcoveOS/refactor-companionad-uitest

Refactoring CompanionAdTestCase.java