Update editable attributes partially

If we receive from PUT smth like:
{"editable": {"storage": {"osd_pool_size": {"value": 3},
"volumes_ceph": {"value": true}}}}

attributes.editable will contain only received data and no default one

Changing paste.TestApp for webtest.TestApp cause TestApp does not have
PATCH method available

Change-Id: I259ee806c9464cb82b391e9c3b633e5e7f5f11d3
Closes-Bug: #1283135
disable /var/lib/glance partition

In case of using ceph-osd as image storage,
dont send /var/lib/glance partition to provisioner
and set max_image_cache_size to 0 in such case

Change-Id: I337c7e3d7f6079a2999592729c9db355a13ed406
Closes-Bug: #1262312
Merge "Update editable attributes partially"
Merge "disable /var/lib/glance partition"