Fix BZ#1102394

Set correct repo name for both EL6 and EL7
Fix BZ#1105328

Menu values can be selected only by number. Hence wrong value does
not list all values but their indices.
Fix BZ#1102706

Staypuft installer asks for Host Gateway and DHCP gateway. The first one
is used staypuft machine (if configure networking is on), the later is
used for DHCP. DHCP gateway will be used by hosts that use DHCP server
managed by staypuft.
Fix BZ#1103151

Validate Repo path. Also print out invalid values in subscription
wizard.
NFS is not supported

Foreman proxy can't download images from NFS.