Change nova api steps generating puppet manifests to fix neutron

Network configuration of nova has to run before common manifest and
after all other manifests in order to iterate over all nodes as
network_api_class has to be set to neutron on all nova nodes.

Closes-Bug: rhbz#1115458
Change-Id: If6e23898f7cbaf381620312b13c72c61f7b57ed1
Merge "Change nova api steps generating puppet manifests to fix neutron"