Remove "" in return sting when getting stack ip when needed

Different heatclient version return output in "" and without "".
This patch allows to get stack IP for any heatclient version by
replacing '"' if it is found in string.
In future migrate to 'openstack stack output show' when all
jobs using heatlient mitaka and later.

Change-Id: Ic01b2fbf206c00e93701a80313ea6c2c81e0958d
1 file changed