Enabling name filter on image metadata api

To enable filter function for image v1 and v2 metadata api, which fixed
issue "Multiple image matches found for '<IMAGE_NAME>', use an ID to be
more specific." caused by that jumpgate returns all images without name
based filter when glanceclient request a image metadata query [0].

[0]
https://github.com/openstack/python-glanceclient/blob/master/glanceclient/common/utils.py#L159

Signed-off-by: Zhi Yan Liu <zhiyanl@cn.ibm.com>
Merge pull request #151 from LiuZhiyan/enable-name-filter-image-metadata-api

Enabling name filter on image metadata api