Restore disconnect notification to ssh plugin
Restore disconnect notification to ssh plugin

The disconnect notification was erroneously removed in
the previous checkin, this restores it.

whowutwut/confluent,xcat2/confluent,xcat2/confluent,xcat2/confluent,xcat2/confluent,whowutwut/confluent,jjohnson42/confluent,whowutwut/confluent,jjohnson42/confluent,whowutwut/confluent,xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent