otasigcheck: Use an explicit exit code for failures

Change-Id: I2b5860ea427a4db7e29b55cc632b92c6e2910494
(cherry picked from commit d2248b27a86b94901b4ed33a528969eeebb46eaf)
(cherry picked from commit 41cbde36f37c66f9aa3f5566ec4814a7e141d348)
sepolicy: Fix permissions for service.adb.tcp.port

This makes the rule more specific by overriding the upstream sepolicy.
Also adds the adbd context which is necessary for "adb tcpip".

Change-Id: Ia17eb56fc1682ab248764329e88eebd2a4075c97
(cherry picked from commit 5c9f9efba68a8de6123eaa341be6dce4b483fd44)
India Hutch is no longer a valid APN

Change-Id: If458a45c9ba1ac39097b6157f7c222e16b779a7c
(cherry picked from commit ec073cf4e37e7ad1b2d1062985951e99f142e691)