Mux state order change (sonic-net#1902)

*Orchagent sometimes took >50ms to finish the state change operations. This change is to update notification to xcvrd (via APPDB) after execution is complete. This enables xcvrd to simulate the direction change after orchagent has completed the state transition.

orchagent/muxorch.cpp

@@ -394,15 +394,14 @@ void MuxCable::setState(string new_state)
     SWSS_LOG_NOTICE("[%s] Set MUX state from %s to %s", mux_name_.c_str(),
                      muxStateValToString.at(state_).c_str(), new_state.c_str());
 
-    // Update HW Mux cable state anyways
-    mux_cb_orch_->updateMuxState(mux_name_, new_state);
-
     MuxState ns = muxStateStringToVal.at(new_state);
 
     auto it = muxStateTransition.find(make_pair(state_, ns));
 
     if (it ==  muxStateTransition.end())
     {
+        // Update HW Mux cable state anyways
+        mux_cb_orch_->updateMuxState(mux_name_, new_state);
         SWSS_LOG_ERROR("State transition from %s to %s is not-handled ",
                         muxStateValToString.at(state_).c_str(), new_state.c_str());
         return;
@@ -430,6 +429,7 @@ void MuxCable::setState(string new_state)
     st_chg_failed_ = false;
     SWSS_LOG_INFO("Changed state to %s", new_state.c_str());
 
+    mux_cb_orch_->updateMuxState(mux_name_, new_state);
     return;
 }