Start loc_launcher as gps user and set uid/gid of loc_launcher
to gps and enable SETUID and SETGID caps for loc_launcher, so
that we can start loc_launcher as gps user instead of root and
still have capabilities for SETUID and SETGID. Also remove not
required permissions groups for loc_launcher.
Change-Id: Ie9f1506874b3c3148f9170c8d5db9afd1e70025c
CRs-Fixed: 2192881