GOLD-645: Bug, remove Solinea cloud definitions from fabfile, and add hook for overriding the simple built-in defaults with environment variable values.
GOLD-645: Bug, remove Solinea cloud definitions from fabfile, and add hook for overriding the simple built-in defaults with environment variable values.

Solinea/goldstone-server,slashk/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server,slashk/goldstone-server,slashk/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server