northd, ic: Fix handling of ovn-appctl resume.

After ovn-appctl resume was issued for northd or ovn-ic, there was no
guarantee that northd or ovn-ic were waking up, potentially handling
changes received while they were paused..
Usually, poll_block would be woken up by POLLHUP, but race conditions could
cause this not to happen.
ovn-controller is already properly handling the resume.

This caused the following tests to fail sporadically:
- ovn-ic -- sync ISB status to INB
- propagate Port_Binding.up to NB and OVS.

Signed-off-by: Xavier Simonart <xsimonar@redhat.com>
Acked-by: Ales Musil <amusil@redhat.com>
Signed-off-by: Numan Siddique <numans@ovn.org>

ic/ovn-ic.c

@@ -2409,7 +2409,7 @@ ovn_ic_resume(struct unixctl_conn *conn, int argc OVS_UNUSED,
 {
     struct ic_state *state = state_;
     state->paused = false;
-
+    poll_immediate_wake();
     unixctl_command_reply(conn, NULL);
 }
 

northd/ovn-northd.c

@@ -1107,6 +1107,7 @@ ovn_northd_resume(struct unixctl_conn *conn, int argc OVS_UNUSED,
 {
     struct northd_state *state = state_;
     state->paused = false;
+    poll_immediate_wake();
 
     unixctl_command_reply(conn, NULL);
 }