New Additions to WifiScanner APIs [DO NOT MERGE]
New Additions to WifiScanner APIs [DO NOT MERGE]

Added single shot scan, and maxScansToCache. Also fixed getScanResults()
to report scan results to listeners.

Bug: 18087596
Bug: 17694040
Bug: 18059273

Change-Id: Id623ab9ee2ab89c86a35082279331fa609016347

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base