* Wait until a share status reaches 'available'
It appears to be that the test_manila_share test case does not wait
until a share becomes available which results in failures like this:
manilaclient.common.apiclient.exceptions.BadRequest: New access rules
cannot be applied while the share or any of its replicas or migration
copies lacks a valid host or is in an invalid state. (HTTP 400)
(Request-ID: req-8d609e13-9a80-428b-953b-17ab8d0e0cae)
Fixes: #309
Dmitrii Shcherbakov
9844701d19