whitespace reformatting in modified section
set AM_RESTART_SLEEP_TIME = 30000 for slower restarts
IDE-suggested reference change in HoyaCommandTestBase
BUG-12782 make time to wait for AM restart configurable, so that slower/overloaded clusters can take longer to come up without test failing
BUG-12782 regression: TestKilledAM stopped working on OS/X & hadoop 2.2 (masters not being killed automatically by YARN)
BUG-12782: Switch off AM restart support at build time, all relevant places tagged with AM-RESTART-SUPPORT.