The unit tests mock tokens from keystoneauth. One of the responses
being returned from a mocked keystoneauth method was returning a v2.0
token that didn't have the right expiration attribute of a v2.0
token. This was caught by keystoneauth 3.0.1, which underwent a
significant refactor and added a bunch of new functionality for
version discovery. Keystoneauth was expecting `expires` to be
in the token but instead the mock was using `expires_at`, which isn't
a valid v2.0 token attribute.

Closes-Bug: 1706538

Change-Id: Iea77ef54585d0b3480369e9f5df629e3f46f7e3b

pycrypto is unmaintained for a while and requirements team advises using
pycryptodome or cryptography libraries instead (see openstack-dev thread
[0]).

troveclient uses pycrypto to generate random data/content in its tests
which does not require any specific cryptographic need. This commit
replaces it by os.urandom from Python standard library.

[0] http://lists.openstack.org/pipermail/openstack-dev/2017-March/113568.html

Change-Id: Ia43c5883a51e8412c4a238d127c13db39e863da1

This change adds database support to the python-openstackclient
project for the datastore-list command.

The trove command datastore-list is now:
    openstack datastore list

Change-Id: I4804e6deae350f05abdb66a6d8813e5581f2b22c
Partially-Implements: trove-support-in-python-openstackclient

This change adds database support to the python-openstackclient
project for the database-list command.

The trove command database-list is now:
    openstack database list

To confirm the databases list command I had to create an instance
and specify a database name like how it shows in the user-guide[1]
on step 2.

[1] http://docs.openstack.org/user-guide/create-db.html

Change-Id: I4f4682eff1addc3fc837f5468939ddd96572e238
Partially-Implements: trove-support-in-python-openstackclient

This change adds database support to the python-openstackclient
project for the list command.

The trove command list is now:
    openstack database instance list

Partially-Implements: blueprint trove-support-in-python-openstackclient
Change-Id: Ic5328827dbf6d1f47db62f0bb2e65e164a0b2b6b

This change adds database support to the python-openstackclient
project for the user-list command.

The trove command user-list is now:
    openstack database user list

Note: Only looking up an instance by ID works. I think it has
something to do with not using osc-lib.find_resource because we
use our own find_resource in the client manager's list call.

Change-Id: If8a4b97b91c661e400dfcac0fa4922ed359ce32a
Partially-Implements: trove-support-in-python-openstackclient

This change adds database support to the python-openstackclient
project for the limit-list command.

The trove command limit-list is now:
    openstack database limit list

Change-Id: I534d30022cbfef4ae596077f604e2a305dbe3146
Partially-Implements: trove-support-in-python-openstackclient

This change adds database support to the python-openstackclient
project for the configuraiton-list command.

The trove command configuration-list is now:
    openstack database configuration list

Change-Id: I3a85260c15b8d1b4a37a806db2cb5ff3c433537b
Partially-Implements: trove-support-in-python-openstackclient

This change adds database support to the python-openstackclient
project for the cluster-list command.

The trove command cluster-list is now:
    openstack database cluster list

Change-Id: I06b398190930db459ef8739685548263499f0d3c
Partially-Implements: trove-support-in-python-openstackclient