Merge pull request #37 from INFN-Catania/master

Added iptables rules for LDAP (accessible with and without ssl from the local network)
Minor changes and typos
minor changes everywhere
Merge branch 'master' of https://github.com/AAROC/ansible-for-grid

Conflicts:
	Ansible/group_vars/CentOS-servers
Added bashpocalypse fix
added bashpocalypse fix to the repo
moving files to the right directory
Added EMI-UI role (from previous UI role)
LDAP idempotent

With last fix if you try to run the playbook again no changes happen
because there is a check before every step to evaluate the current status
of the remote machine.

If the remote machine is installed, even it is differently configured, there should
not be changes, although in some special condition it could happen