Update help message of flag 'enable_isolated_metadata'

Thanks to the commit c73b54e50b62c489f04432bdbc5bee678b18226e,
the way of DHCP agent determines how a subnet is isolated evolves.
But the flag help message wasn't updtated accordingly to this evolution.

Change-Id: If07d8e0802524f9babdee0c8cc07d40cb0803afb
Closes-bug: #1269722

diff --git a/etc/dhcp_agent.ini b/etc/dhcp_agent.ini
index 583f136e64b8e9455b57c2ad14098dffab67a4ae..9836d350007d4a55b97520834fc2dff57070987d 100644 (file)
--- a/etc/dhcp_agent.ini
+++ b/etc/dhcp_agent.ini
@@ -36,9 +36,9 @@
 
 # The DHCP server can assist with providing metadata support on isolated
 # networks. Setting this value to True will cause the DHCP server to append
-# specific host routes to the DHCP request.  The metadata service will only
-# be activated when the subnet gateway_ip is None.  The guest instance must
-# be configured to request host routes via DHCP (Option 121).
+# specific host routes to the DHCP request. The metadata service will only
+# be activated when the subnet does not contain any router port. The guest
+# instance must be configured to request host routes via DHCP (Option 121).
 # enable_isolated_metadata = False
 
 # Allows for serving metadata requests coming from a dedicated metadata