Allow configuration of multiple glance stores

Glance can handle multiple stores at the same time,
we just need to allow configuring them at the same time.
Fix setup of Glance VSphere Store

When using a vCenter based store, we need the
datacenter path to be configured.
Merge pull request #229 from dirkmueller/master

Glance VSphere fixes
webui: Remove some attributes from webui

These settings are not extremely useful, so don't display them anymore.
They're still available in the raw view.

bind_open_address, image_cache_datadir, image_cache_stall_timeout,
sql_idle_timeout
Merge pull request #230 from vuntz/simplify-ui

webui: Remove some attributes from webui
Use helpers from new crowbar-openstack cookbook
Merge pull request #233 from vuntz/openstack-helper

Use helpers from new crowbar-openstack cookbook
Make glance-scrubber.conf owned by root:glance, instead of glance:root

We don't want the glance user to be able to write the file.
Merge pull request #234 from vuntz/fix-owner

Make glance-scrubber.conf owned by root:glance, instead of glance:root
Fix VMware spelling
Merge pull request #235 from mjura/vmware-rename

Fix VMware spelling