CheckNetwork has been moved to IP module

Conflicts:
	src/uifunctions.ycp
Adjusted package requirements

Conflicts:
	yast2-firewall.spec.in
Changes file entry and new version
Using shared IP::CheckNetwork instead of buggy one in SuSEFirewallExpertRules
Adjusted to SP3
Replacing IPv4 only with both IPv4 and IPv6 support
Removed unneeded import
Using ValidNetwork from IP module

Conflicts:
	package/yast2-firewall.changes
Explicitly mentioning IPv6 in "why"

Conflicts:
	package/yast2-firewall.changes
Shortening lines
Shortening lines
Merge pull request #2 from kobliha/Code-11-SP3

Using fixed checking for correct network definition (bnc#800592)