srvcfg-manager State change issue fix.

srvcfg-manager State change is not working as
it need to act on both .service and .socket files.
Also used MaskUnitFiles and UnmaskUnitFiles to
make changes persistent.

Tested By:
 Disabled/Enabled the state and checked  the service
 is stopping/starting properly. Also rebooted system
 and checked persistent behaviour. Checked changing
 port/channel and validated functionality.

Change-Id: Ib0dce95db3926f5d700fb729aae7bdac1caf64e4
Signed-off-by: AppaRao Puli <apparao.puli@linux.intel.com>
3 files changed