metadata option doesn't support unicode

[Alexey Stupnikov]

Due to suboptimal type restriction it is impossible to provide unicode arguments with --metadata option.

Example:

cinder create --metadata 'test'='тест' 1
usage: cinder create [--consisgroup-id <consistencygroup-id>]
                     [--snapshot-id <snapshot-id>]
                     [--source-volid <source-volid>]
                     [--source-replica <source-replica>]
                     [--image-id <image-id>] [--image <image>] [--name <name>]
                     [--description <description>]
                     [--volume-type <volume-type>]
                     [--availability-zone <availability-zone>]
                     [--metadata [<key=value> [<key=value> ...]]]
                     [--hint <key=value>] [--allow-multiattach]
                     [<size>]
error: argument --metadata: invalid str value: u'test=u\u0442\u0435\u0441\u0442'
Try 'cinder help create' for more information.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/467553

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/467553
Committed: https://git.openstack.org/cgit/openstack/python-cinderclient/commit/?id=760cc59c5a34133f6b34118fd4b1e3b902c7e297
Submitter: Jenkins
Branch: master

commit 760cc59c5a34133f6b34118fd4b1e3b902c7e297
Author: Alexey Stupnikov <email address hidden>
Date: Wed May 24 12:33:57 2017 +0300

    Cleared type restrictions for metadata option

    It turns out that it is impossible to send unicode metadata
    values with some cinder commands. The reason is a type restriction
    that demands all values to be a 'str' type. As a result, it is
    impossible to use unicode.

    Change-Id: I1213b0d3b8177b670cd3e5d587fee9dabd971923
    Closes-bug: #1693151

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-cinderclient 2.2.0 release.