Fix NFS when DHCP settings use a custom IP range

Only use the static IP if it is indeed a static IP. Otherwise assume
it's DHCP and get the IP that way.
Fixes #4450, add another expand_path ../ to get back to the guests directory
Merge pull request #4461 from andytson/feature/redhat-network-file-traversal-fix

guests/redhat: Fixes #4450, add another expand_path ../ to get back to the guests directory
Fix failure to detect RHEL 7 flavours
Merge pull request #4462 from andytson/feature/redhat-flavour-fix

guests/redhat: Fix failure to detect RHEL 7 flavours
Update CHANGELOG
Merge pull request #4434 from simoleone/fix-nfs-with-dhcp-custom-range

Fix NFS when DHCP settings use a custom IP range
Update CHANGELOG
kernel/v2: always forward SSH [GH-4437]
providers/virtualbox: cleaner ignore DHCP
v1.6.5
Move question about which network to bridge to en.yml, give it more context.