OVPN: remove firewall 'sed' more specific and

caught my firewall script using 4 instead of 2.
OVPN:added change to client firewall remove...

this should have been done at the same time as the server firewall rule, i know, sorry.
Merge pull request #673 from avihsnis/master

OVPN: remove firewall 'sed' more specific and also handle clients