Removed erronus config file comment

The comment stating 'DHCP agents needs it.' with regards to the
rpc_notifier notification_driver is incorrect.  Looking through
the code, I see no place this is true.  I believe it to be an
error.

Closes-Bug: #1258390

Change-Id: I58c2f9290731f3e88e4b4a5bdb600aa5bac1a12b
Merge "Removed erronus config file comment"