
When running with the manila plugin on ubuntu Xenial, devstack fails with a message when attempting to create a logical volume within the glusterfs VG with a message about insufficient allocatable extents [1]. Change the hard-coded number of extents supplied to the lvcreate command to a percentage of the VG. Closes-bug: #165238 Change-Id: Ia53f0e1b9b80ae0012d720a3f7b3696cadbd843c