Cleaned up unused code.

Change-Id: I27ba357bc654175136ab7a2505a23eda4569fde6
Fixing typos and unnecessary functions

Change-Id: Ia96861bf7ed928a55dd4b86505685148fbeb7591
Added Complete-SQLServerAfterSysPrepForAOAG method with complete documentation.

Change-Id: Ia96861bf7ed928a55dd4b86505685148fbeb7591