Make snapshot force parameter boolean

[Edward Hope-Morley]

the --force parameter used in cinderclient commands is currently string which makes no sense since it is inherentlty boolean.

Let's make sure that for the next api version bump we fix this.

[Edward Hope-Morley (hopem)]

e.g. metavar='<True|False>' should be action=store_true,

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/80954

[Qiang Zhang (strony-zhang)]

The proposed fix:
https://review.openstack.org/#/c/80954/

[yatin (yatinkarel)]

The proposed fix:
https://review.openstack.org/#/c/170724/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/170724
Committed: https://git.openstack.org/cgit/openstack/python-cinderclient/commit/?id=c15ab5b557ca016605724377982521ec0d311277
Submitter: Jenkins
Branch: master

commit c15ab5b557ca016605724377982521ec0d311277
Author: yatin karel <email address hidden>
Date: Sun Apr 5 21:07:31 2015 +0530

    Change --force parameter into boolean

    Change --force parameter into boolean, now user can use it as boolean,
    without specifying True or False with it. It is still backward
    compatible with --force True|False. This can be deprecated in future.

    Closes-Bug: #1244453
    Change-Id: Id245af1fa0db27912439a420c37aefca530894ba