Change-Id: Idfdb063db10e270835bc12f0ec751e2a9e6ffa4b

This change adds database support to the python-openstackclient
through a plugin and tests.

The support can be demonstrated through the implementation of
the trove command flavor-list which is now:
    openstack database flavor list

Use the -v or --debug flag to see the calls being made to the correct
flavor list function.

ubuntu@ubuntu:~$ openstack database flavor list -v
START with options: [u'database', u'flavor', u'list', u'-v']
command: database flavor list -> troveclient.osc.v1.flavors.ListFlavors
Using auth plugin: password
+-----+-----------+-------+-------+------+-----------+
|  id | name      |   RAM | vCPUs | Disk | ephemeral |
+-----+-----------+-------+-------+------+-----------+
|   1 | m1.tiny   |   512 |     1 |    1 |         0 |
|   2 | m1.small  |  2048 |     1 |   20 |         0 |
|   3 | m1.medium |  4096 |     2 |   40 |         0 |
|   4 | m1.large  |  8192 |     4 |   80 |         0 |
|  42 | m1.nano   |    64 |     1 |    0 |         0 |
| 451 | m1.heat   |   512 |     1 |    0 |         0 |
|   5 | m1.xlarge | 16384 |     8 |  160 |         0 |
|  84 | m1.micro  |   128 |     1 |    0 |         0 |
|  c1 | cirros256 |   256 |     1 |    0 |         0 |
|  d1 | ds512M    |   512 |     1 |    5 |         0 |
|  d2 | ds1G      |  1024 |     1 |   10 |         0 |
|  d3 | ds2G      |  2048 |     2 |   10 |         0 |
|  d4 | ds4G      |  4096 |     4 |   20 |         0 |
+-----+-----------+-------+-------+------+-----------+
END return value: 0

Change-Id: I308a6c6f3f5ce7dbb814ec0fd8ecb1734a2f137f
Partially-Implements: trove-support-in-python-openstackclient

To facilitate the concept of live-update, a new command
'reapply' has been added to reapply a given module
to all instances that it had previously been applied to.

Originally, a module designated live-update would automatically
be re-applied whenever it was updated.  Adding a specific
command however, allows operators/users more control over
how the new payload would be distributed.  Old 'modules'
could be left if desired, or updated with the new command.

Change-Id: Ic4cc9e9085cb40f1afbec05caeb04886137027a4
Partial-Bug: #1554903
Depends-On: I4caf4a57226dd711575cde766076fa25d16792e2

Added a --count_only flag to the call for module instances
to return a summary of the applied instances
based on the MD5 of the module (this is most useful
for live_update modules, to see which ones haven't been
updated).

Added a new module-instance-count command.  This was done
to facilitate getting the summary, since it returns
a different result set.  It basically calls the
same python interface as module-instances, but adds
the --count_only flag.

Also added some missing tests.

Change-Id: Iea661166bf3a4f3520a590da5954aedcd0036243
Partial-Bug: #1554900
Depends-On: I4caf4a57226dd711575cde766076fa25d16792e2

Change-Id: Ibb6eabc88fc83f65ce95efd32218df53d7ff112e