Automatic merge from submit-queue.

Uninstall playbook for Glusterfs 

Uninstall playbook for Glusterfs

Automatic merge from submit-queue.

Revert "GlusterFS: Remove image option from heketi command"

This reverts commit 3d3853836d71c37a9c81aea8e606c94052439789 which was
supposedly a fix for an issue with topology initialization, but that
turned out to be a separate issue fixed in commit
b8879b5c6731bd51e590b470b1a51fce73db0ee1. By default "heketi-cli
setup-openshift-heketi-storage" uses the "heketi/heketi:dev" image
while, for OpenShift Container Platform installations, the default image
for all other operations is "rhgs3/rhgs-volmanager-rhel7". In
environments where only a limited set of Docker registries is available,
i.e. only the Red Hat registry but not Docker Hub, using
"heketi/heketi:dev" does not work or would require manual intervention.

The discussion surrounding the removal of "--image" in PR#5769 involved
statements that "--image" was removed from Heketi. As of January 30,
2018 the master branch contains the option, as does the upstream Docker
image (Heketi version v5.0.0-225-gffb9fea) and the aforementioned
"rhgs3/rhgs-volmanager-rhel7" image.

Tested with OpenShift Container Platform 3.7.23.

fix block indentatation

Signed-off-by: Saravanakumar Arumugam <sarumuga@redhat.com>

Signed-off-by: Saravanakumar Arumugam <sarumuga@redhat.com>

Automatic merge from submit-queue.

dynamic inventory bug when group exists but its empty

@jarrpa output from my test for the gluster block

I use dynamic inventory. And the result of this is that ansible see all possible groups available, but some of them are empty [1]. Because group exists, fist condition is evaluated as true and it fails with the array is an empty error...  
```
...
'all': [u'54.144.5.175',                                                                                                                                                                                          
         u'52.200.175.54',                                                                                                                                                                                         
         u'54.237.208.252',                                                                                                                                                                                        
         u'52.55.224.72',                                                                                                                                                                                          
         u'52.207.103.246',                                                                                                                                                                                        
         u'34.227.95.191',                                                                                                                                                                                         
         u'34.238.127.160'],                                                                                                                                                                                       
 u'bastion': [u'34.227.95.191'],                                                                                                                                                                                   
 u'bastion.0': [u'34.227.95.191'],                                                                                                                                                                                 
 u'etcd': [u'34.238.127.160'],                                                                                                                                                                                     
 u'glusterfs': [u'52.200.175.54', u'52.207.103.246', u'54.144.5.175'],                                                                                                                                             
 u'glusterfs.0': [u'52.200.175.54'],                                                                                                                                                                               
 u'glusterfs.1': [u'52.207.103.246'],                                                                                                                                                                              
 u'glusterfs.2': [u'54.144.5.175'],                                                                                                                                                                                
 u'glusterfs_registry': [],                                                                                                                                                                                        
 u'infra': [u'52.55.224.72'],                                                                                                                                                                                      
 u'infra.0': [u'52.55.224.72'],
 u'masters': [u'34.238.127.160'],
 u'masters.0': [u'34.238.127.160'],
...
```