For a driver that doesn't support snapshots, a share type with
snapshot_support = '<is> False' will prevent share creation.
Root cause is code in HostManager that improperly checks whether
snapshot_support (and other boolean properties) is set on each
pool. This commit fixes the check for the boolean pool capabilities.
Change-Id: I6a488788926cca119498b3de992beec3b0545259
Closes-Bug: #1498646
(cherry picked from commit 8a34fb3890)