Add create_share_from_snapshot_support in Dell EMC drivers

[Peter Wang]

This fixes following issue in Dell EMC CIs:

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/opt/stack/new/manila/manila_tempest_tests/tests/api/test_shares.py", line 157, in test_create_share_from_snapshot
        self.protocol, snapshot_id=snap["id"], cleanup_in_class=False)
      File "/opt/stack/new/manila/manila_tempest_tests/tests/api/base.py", line 453, in create_share
        result = cls.create_shares([{"args": args, "kwargs": kwargs}])
      File "/opt/stack/new/manila/manila_tempest_tests/tests/api/base.py", line 495, in create_shares
        *local_d["args"], **local_d["kwargs"])
      File "/opt/stack/new/manila/manila_tempest_tests/tests/api/base.py", line 410, in _create_share
        share = client.create_share(**kwargs)
      File "/opt/stack/new/manila/manila_tempest_tests/services/share/v2/json/shares_client.py", line 228, in create_share
        resp, body = self.post("shares", body, version=version)
      File "/opt/stack/new/manila/manila_tempest_tests/services/share/v2/json/shares_client.py", line 62, in post
        return super(SharesV2Client, self).post(url, body, headers=headers)
      File "tempest/lib/common/rest_client.py", line 276, in post
        return self.request('POST', url, extra_headers, headers, body, chunked)
      File "tempest/lib/common/rest_client.py", line 665, in request
        resp, resp_body)
      File "tempest/lib/common/rest_client.py", line 768, in _error_checker
        raise exceptions.BadRequest(resp_body, resp=resp)
    tempest.lib.exceptions.BadRequest: Bad request
    Details: {u'code': 400, u'message': u"Share cannot be created from snapshot 'ac756400-40c8-478a-8f9b-8866d0269ad1', because share back end does not support it."}

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/415414

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/415414
Committed: https://git.openstack.org/cgit/openstack/manila/commit/?id=c341e52b5e34930dd64af43249504fb7b8413aae
Submitter: Jenkins
Branch: master

commit c341e52b5e34930dd64af43249504fb7b8413aae
Author: Peter Wang <email address hidden>
Date: Thu Dec 29 00:46:37 2016 +0800

    Report create_share_from_snapshot_support

    Set create_share_from_snapshot_support as True in order to
    be able to create share from snapshot.

    This fixes all Dell EMC drivers issue like below:
      Share cannot be created from snapshot

    Change-Id: If43d9b15b21a2ae74c6872726e9e537501697405
    Closes-Bug: #1652911

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/manila 4.0.0.0b3 development milestone.