ASACORE-879 Return ER_BUS_ENDPOINT_CLOSING in PushMessage if endpoint is stopping.
ASACORE-879 Return ER_BUS_ENDPOINT_CLOSING in PushMessage if endpoint is stopping.

Change-Id: I31d392c0a58f26b187969a8b29e95a27358301ce
Signed-off-by: Sheshambika Venkateshwaran <da32b3b3b1173d63b23a99c9246ebdac628a39a9@qce.qualcomm.com>

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