Add filters to 'fuel2 task list' command

[OpenStack Infra]

https://review.openstack.org/356232
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.

commit 44843c40cc98906e50202431bebb6dc77688a9d9
Author: tivaliy <email address hidden>
Date: Wed Aug 17 08:22:57 2016 +0300

    Add filters to 'fuel2 task list' command

    Now Nailgun supports filtering transactions by statuses,
    cluster_id and transaction_types
    (commit 8257a0dbcb680e4eb9c19afe027b3a0fbdb0e7be).
    This patch adds filtering support for 'fuel2 task list' command.

    usage: fuel2 task list [-h] [-f {csv,html,json,table,value,yaml}]
                           [-c COLUMN] [--max-width <integer>] [--noindent]
                           [--quote {all,minimal,none,nonnumeric}]
                           [-s SORT_COLUMN [SORT_COLUMN ...]] [-e ENV]
                           [-t {pending,error,ready,running}
                               [{pending,error,ready,running} ...]]
                           [-n NAMES [NAMES ...]]

    DocImpact
    Closes-Bug: 1613674

    Change-Id: I8e33944a422a7847e055318b9d73e872244117c7