Sometimes openstackclient can hang if Keystone
API fails to respond to requests.
This patch adds retries to work around these
situations.
* Retry and timeouts for openstack command
-'command_timeout=20':
after this timeout openstack command is retried
untill the request_timeout.
(The value of command_timeout parameter was updated
from 10 to 20 as it was observed that "10" value is
not enough when sytem was overloaded.)
-'request_timeout=60':
timeout of the entire request.
-'retry_sleep=3':
interval between command retries
* Does not retry non-idempotent actions.
* Improve specs
Change-Id: Ifd8ae1b00321366e3a54fd6fe4a68db46bb743c7
701b6fe0ac