bug fix: no need to provide pem-file when doing cluster ssh to facet/facet-index
member_of_security_group removed, added security groups mappings instead, requires existence of security_groups.mappings data bag item
launch_spec to have cloud_provider
Merge branch 'develop' of github.com:Technicolor-Portico/ironfan into rackspace

Conflicts:
	lib/chef/knife/cluster_ssh.rb