BSN: Capabilities check double-json parse

[Kevin Benton]

The capabilities check in the BigSwitch server manager tries to call json.loads on an object that has already been decoded and fails. This
causes the servers to have an empty capability list so none of the newer features are leveraged.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/97655

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/icehouse
Review: https://review.openstack.org/97658

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/97655
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=63d271d4e4a8bab947f90f457ed176e46135d39e
Submitter: Jenkins
Branch: master

commit 63d271d4e4a8bab947f90f457ed176e46135d39e
Author: Kevin Benton <email address hidden>
Date: Mon Jun 2 21:39:51 2014 -0700

    Big Switch: fix capabilities retrieval code

    References the raw REST response in the capabilities
    parsing code so json.loads doesn't get an object
    that may already be decoded and fail.

    Closes-Bug: #1326173
    Change-Id: Ia3179b7499f35a6ab2e9ce1631ab15ed27d64647

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/97658
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=5285164260f5e6e40f97eaf75b629adc9b55358b
Submitter: Jenkins
Branch: stable/icehouse

commit 5285164260f5e6e40f97eaf75b629adc9b55358b
Author: Kevin Benton <email address hidden>
Date: Mon Jun 2 21:39:51 2014 -0700

    Big Switch: fix capabilities retrieval code

    References the raw REST response in the capabilities
    parsing code so json.loads doesn't get an object
    that may already be decoded and fail.

    Conflicts:
     neutron/tests/unit/bigswitch/test_capabilities.py
     neutron/tests/unit/bigswitch/test_servermanager.py

    Closes-Bug: #1326173
    Change-Id: Ia3179b7499f35a6ab2e9ce1631ab15ed27d64647