Add crowbar-status and crowbar-failed in schema

Otherwise, barclamp_mgmt_lib.rb will edit the schema and add them, which
will make the files differ from the ones in the package.

Part of https://bugzilla.novell.com/show_bug.cgi?id=776583
Set proposal_schema_version to 2 in crowbar.yml

This is needed when we have crowbar-status/crowbar-failed in the schema.
Move quantum_metadata_proxy_shared_secret out of network

The attributes in network are really about nova-network, which is not
the case here.
Merge pull request #206 from vuntz/not-in-network

https://github.com/crowbar/barclamp-nova/pull/206

Merged by devtool for cloudsleuth
Merge pull request #208 from vuntz/add-missing-attributes

Add crowbar-status and crowbar-failed in schema [13/18]