VOL-1275: Fix output for OMCI show command: reference other cmds

Change-Id: I9e6b1b66060a70ad3d9f56b07d27dca9ccbe0c50
diff --git a/cli/omci.py b/cli/omci.py
index 0478a02..17e24ba 100644
--- a/cli/omci.py
+++ b/cli/omci.py
@@ -355,3 +355,7 @@
             self.stdout.write(msg)
             if msg[-1] != '\n':
                 self.stdout.write('\n')
+
+    def do_show(self, _):
+        """Show detailed omci information"""
+        self.poutput('Use show_mib, show_alarms, show_me, show_msg_types for detailed OMCI information')