Pass glance image parameters as a hash

[OpenStack Infra]

https://review.openstack.org/363535
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.

commit f77e0733c78eb970af77812916aa8520a163f6af
Author: Alex Schultz <email address hidden>
Date: Tue Apr 5 11:09:49 2016 -0600

    Pass glance image parameters as a hash

    This change updates the deployment serializer for the test vm data to
    pass the glance properties as a hash that can be used by the
    glance_image provider rather than using the glance_properties string
    that is currently in place. The glance_properties string should be
    considered deprecated and anything that uses it should switch to the
    properties hash.

    DocImpact: glance_properties string provided as part of the
    test_vm_image hiera data is deprecated in favor of the properties hash
    provided by this change

    Change-Id: I79a9b20d89ae00a7ceaa24c4ce655cbd16972c30
    Partial-Bug: #1618662
    Partial-Bug: #1566434
    (cherry picked from commit 85e9a608f40d3b507154bdb600f0b93cc015e877)