Input Validation for IpSecService

All of the input to IpSecService over the Binder
interface needs to be validated both for sanity
and for safety.

-Sanity check all the parameters coming from binder.
-Added setters for IpSecConfig to decouple the test
 from the IpSecManager. This was needed because the
 input validation caused the tests to fail due to a
 null parameter that was previously un-tested.
-Added the mode flag to the IpSecConfig bundle this
 oversight was found during testing.
-Expose the getResourceId() methods for testing in
 UdpEncapsulationSocket, SecurityParameterIndex, and
 IpSecTransform classes.
-Remove the unneeded getIpSecConfig() from
 IpSecTransform: unneeded now that we can synthesize
 configs.

Bug: 38397094
Test: runtest frameworks-net
Change-Id: I5241fc7fbfa9816d54219acd8d81a9f7eef10dd4