Create Seed environment with the latest release
Create Seed environment with the latest release

Currently, only the latest release for every suppported operating system is
marked as 'deployable', so remove hardcoded release version and find the
deployable release for the given operating system instead.

Change-Id: Iea8c0a70ef4a58c6bb69ec991f8fca2cea50e1fc

Mirantis/octane,stackforge/fuel-octane,stackforge/fuel-octane,Mirantis/octane