Merge pull request #63 from srvaroa/v1.2.0-rc2.release

Update version to 1.2.0-rc2
Add new client APIs and midonet-cli

- Added new API for the system_state URI.
- Added new API for the write_version URI.
- Added corresponding updates to the midonet-cli

Signed-off-by: Joe Mills <joe@midokura.com>
Merge pull request #64 from JoeMido/MN-564

Add new client APIs and midonet-cli
Add new "availability" field to system_state

Fix MN-583

Signed-off-by: Joe Mills <joe@midokura.com>
Merge pull request #65 from JoeMido/avail_field

Add new "availability" field to system_state
Add host_version client API

- Added new get_host_versions API
- Added new HostVersion object
- Added HostVersion to the midonet-cli

Signed-off-by: Joe Mills <joe@midokura.com>
Merge pull request #66 from JoeMido/MN-620

Add host_version client API
Update versions in package spec files

Signed-off-by: Galo Navarro <galo@midokura.com>