Refactor the host adb argument parsing loop to remove a goto

Change-Id: I3412ac473abc4efa51a6275658e65f7191b5439d
Fix some style issues in adb_commandline().

Change-Id: I8ed7899e7e137405594b3f3cbb0a87eae411dfc9
Revert "Move property_context label handling to libselinux."

Emulator fails to boot.

This reverts commit 98069027bd90d2139d54affa1367dcd3317a1c11.

Bug: 18692152
Change-Id: If362e1311bc3f07e033ba81190c05608ada7c361
Merge "Revert "Move property_context label handling to libselinux.""
Merge "Refactor the host adb argument parsing loop to remove a goto"
Merge "Fix some style issues in adb_commandline()."