ComputeCapabilitiesFilter fail because cpu_info is loaded as unicode

[Facundo Maldonado]

cpu_info data is loaded as unicode in HostState.
ComputeCapabilitiesFilter fails to get attributes from this property.

This will fail:
    capabilities:cpu_info:features <in> aes
    capabilities:cpu_info:vendor = Intel

while this will pass
   capabilities:hypervisor_type = QEMU
   hypervisor_type = QEMU

[Facundo Maldonado (facundo-n-maldonado)]

Splited from https://bugs.launchpad.net/nova/+bug/1279719

[Facundo Maldonado (facundo-n-maldonado)]

Review: https://review.openstack.org/#/c/89844/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/89844
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=eeeb5830e3ddadcc3f662ef3512f16af0ec1cac4
Submitter: Jenkins
Branch: master

commit eeeb5830e3ddadcc3f662ef3512f16af0ec1cac4
Author: Pawel Koniszewski <email address hidden>
Date: Wed Jul 30 09:10:09 2014 -0400

    Parse unicode cpu_info as json before using it

    If the extra specs are some of this:
    - (capabilities:cpu_info:vendor, Intel)
    - (capabilities:cpu_info:topology:cores, 2)
    - (capabilities:cpu_info:features, <in> rdtscp)

    It doesn't work because the cpu_info is loaded as unicode in HostState.
    The patch fix these cases by parsing the cpu_info to dict.
    Update: use six.string_types instead of unicode.

    Change-Id: Ieabf95b1e3e5893ced16c0571c29b13b252df5d1
    Closes-Bug: #1331176
    Co-Authored-By: Pawel Koniszewski <email address hidden>