Add ability to use filters on stack-list by passing a ``--filters``
options to the command line. This option can appear multiple times or
be used once with several key=value filters separated by semicolons. If
the same key appears more than once, both will be taken into account
when sending the request to the API.
e.g.:
The option:
``--filters status=COMPLETE;status=FAILED``
Will issue the call:
``/stacks?status=COMPLETE&status=FAILED``
Closes-Bug: 1268816
Change-Id: I553d6b5e3ceebdb24dcd4e4c8e409a4375d72333