Always lowercase role name

Due to [1] ansible always access servers lowcase. Also, in respect to [2], this
patch lowercase name which is use in fqdn, hostname, ssh_known_hosts and other
places.

[1] aa4278e5f3
[2] https://tools.ietf.org/html/rfc4343

Change-Id: Ib25832496d6504def436414b9c2903cbfe5854d4
Resolves: rhbz#1619556

puppet/role.role.j2.yaml

@@ -411,7 +411,7 @@ resources:
       user_data: {get_resource: UserData}
       name:
         yaql:
-          expression: $.data.hostname_map.get($.data.hostname, $.data.hostname)
+          expression: $.data.hostname_map.get($.data.hostname, $.data.hostname).toLower()
           data:
             hostname: {get_param: Hostname}
             hostname_map: {get_param: HostnameMap}