Fix to support subscribing event from another thread
Bug: When itti_subscribe_event_fd()
is called with new fd while the corresponding ITTI 'task' is blocked by itti_receive_msg()
, the itti_receive_msg()
never returns.
Scenario: In F1 and E1 split (MR !1629 (merged)), gtpv1Init()
is called from outside of TASK_GTPV1.