mistral python client is missing in requirements.txt

[Kanagaraj Manickam]

https://github.com/openstack/heat/blob/master/requirements.txt does have support for mistral python client.
so this bug is filed to add the same in the heat requirements.txt as it currently does not exit.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/205005

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/205006

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/205005
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=ce2bc17c95972d8b5c1f7e145a3e770358b0f597
Submitter: Jenkins
Branch: master

commit ce2bc17c95972d8b5c1f7e145a3e770358b0f597
Author: Kanagaraj Manickam <email address hidden>
Date: Thu Jul 23 16:04:29 2015 +0530

    Adds python-mistralclient>=1.0.0 in requirements.txt

    Openstack global-requirements.txt has the mistralclient
    and same has been made to be in sync in heat requirements.txt

    Change-Id: I523b289242baf958cbebcaa06eb8e719dbe4691e
    Partial-Bug: #1477498

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/205006
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=b31f4f8bcb84ebc3d21dab3440b66028147b87fb
Submitter: Jenkins
Branch: master

commit b31f4f8bcb84ebc3d21dab3440b66028147b87fb
Author: Kanagaraj Manickam <email address hidden>
Date: Thu Jul 23 16:28:11 2015 +0530

    Import mistral python client directly

    Python mistral client is now part of requirements.txt.
    So this patch fixes mistral client plug-in and test
    cases to use it directly.

    Closes-bug: #1477498

    Change-Id: I334d0d7997000e7fb3e077930442838b7e0b0290