Update mainz2

Add right address vor mainz2
Update mainz1

change ip to domain
Merge branch 'master' of https://github.com/freifunk/icvpn
main1 will be wiesbaden2 from now on
change Wiesbaden addresses to FQDN instead IPs
generic FQDN for mainz2
Merge pull request #42 from freifunk-mwu/master

various improvements for Mainz & Wiesbaden