Removed unused variable from firewall_proposal.ycp
Removed functionality which was moved to firewall_stage1_proposal

firewall_stage1_proposal is currently placed in yast2-network and should
be later moved into yast2-firewall.

the moved functionality is enabling/disabling firewall at all resp.
opening/closing firewall for ssh / vnc.
Updated changelog.
Merge pull request #10 from mchf/master

Removed functionality which was moved into first stage already.