Clarify skel_setup parameter documentation
Clarify skel_setup parameter documentation

Renaming environment_file parameter to environment
clarifies that the argument is a dict, not a path to
an environment file

Change-Id: I51cfd7650c9da08c9250c52e7f80581c968bb5f7

weezer/openstack-ansible,mrda/openstack-ansible,mancdaz/openstack-ansible,bunchc/openstack-ansible,BjoernT/os-ansible-deployment,cloudnull/os-ansible-deployment,BjoernT/os-ansible-deployment,weezer/openstack-ansible,major/os-ansible-deployment,bunchc/openstack-ansible,robb-romans/openstack-ansible,mancdaz/openstack-ansible,Logan2211/openstack-ansible,major/openstack-ansible,openstack/openstack-ansible,yanyao/openstack-ansible,stackforge/os-ansible-deployment,yanyao/openstack-ansible,cfarquhar/openstack-ansible,BjoernT/openstack-ansible,openstack/openstack-ansible,Logan2211/openstack-ansible,major/os-ansible-deployment,BjoernT/openstack-ansible,stackforge/os-ansible-deployment,mrda/openstack-ansible,yanyao/newton,cfarquhar/openstack-ansible,BjoernT/os-ansible-deployment,cloudnull/os-ansible-deployment,os-cloud/os-ansible-deployment,os-cloud/os-ansible-deployment,mrda/openstack-ansible,yanyao/newton,robb-romans/openstack-ansible,major/openstack-ansible