ASACORE-168: Ignore policy rules for invalid users and groups
ASACORE-168: Ignore policy rules for invalid users and groups

Fixes a bug where the routing node would exit when parsing a config that
specifies an non-existant user or group.

Change-Id: I1552cdfe7c411229c993b365e3d314ef83c27b0d
Signed-off-by: Steve Kinneberg <26c7c4dbb497207ccdafd1b965a306c70c2e698b@qce.qualcomm.com>

cybertanyellow/alljoyn-core,cybertanyellow/alljoyn-core,cybertanyellow/alljoyn-core,cybertanyellow/alljoyn-core,cybertanyellow/alljoyn-core,cybertanyellow/alljoyn-core,cybertanyellow/alljoyn-core