Description of problem:
When using gdeploy to setup ctdb it picks up the list from hosts as ctdb_nodes and stores it into /etc/ctdb/nodes, regardless of finding hostnames or ip addresses. Since ctdb expects ip address format for entries in /etc/ctdb/nodes it fails to start with error message.

Version-Release number of selected component (if applicable):
gdeploy-2.0.2-14.el7rhgs.noarch

How reproducible:
Always.


Steps to Reproduce:
1. use hostnames instead of ip addresses in [hosts] section of gdeploy config file
2. don't specify ctdb_nodes list
3. run gdeploy 

Actual results:
gdeploy fails with error messages:

PLAY [gluster_servers] ************************************************************************************************************************

TASK [start/stop/restart/reload services] *****************************************************************************************************
failed: [gl-t3] (item=ctdb) => {"failed": true, "item": "ctdb", "msg": "Unable to start service ctdb: Job for ctdb.service failed because the control process exited with error code. See \"systemctl status ctdb.service\" and \"journalctl -xe\" for details.\n"}
failed: [gl-t2] (item=ctdb) => {"failed": true, "item": "ctdb", "msg": "Unable to start service ctdb: Job for ctdb.service failed because the control process exited with error code. See \"systemctl status ctdb.service\" and \"journalctl -xe\" for details.\n"}
failed: [gl-t1] (item=ctdb) => {"failed": true, "item": "ctdb", "msg": "Unable to start service ctdb: Job for ctdb.service failed because the control process exited with error code. See \"systemctl status ctdb.service\" and \"journalctl -xe\" for details.\n"}
	to retry, use: --limit @/tmp/tmpyUmGR5/service_management.retry


and from /var/log/log.ctdb:
2017/11/21 00:44:12.235065 ctdbd[7040]: CTDB starting on node
2017/11/21 00:44:12.236956 ctdbd[7040]: ../ctdb/common/system_util.c:123 Failed to translate gl-t1 into sin_addr
2017/11/21 00:44:12.236973 ctdbd[7040]: Failed to load nodes file "/etc/ctdb/nodes"



Expected results:
gdeploy should not put hostnames into /etc/ctdb/nodes

Additional info:
full trace see https://github.com/mattmuench/bug-traces/blob/master/bug-ctdb_nodes--gdeploy-2.0.2-14