Add support for ceph-client relation.
Rename.
Refactor some code.
Symlink hook.
Merged from trunk.
Install bzr and python-support when building package from branch.
Addressed rewiew comments #2, #8, #9.
Addressed #5.
Addressed #0 and #3.
Address remaining review points.
Save juju API addresses so the client reports them.
Addressing Free's review points #10 and #11.
Exit with error if writing ceph config files fails (per David's review).
Add workaround to create client directories tree with old client versions.
Only write Juju meta-data that are set.
Merged ceph-client-interface [r=ahasenack,davidpbritton,free.ekanayaka]
[a=ack]

This adds the ceph-client interface to landscape-client charm, so that when the
subordinate is related to a ceph service it gets the client key through the
relation.
This will allow the landscape-client ceph plugin to pull information about ceph
rings without running as root.
It also saves juju API endpoints to landscape-client meta-data dir, so the
client can report them to landscape.
Bumped charm revision. [trivial]