Rename Savanna to Sahara in requirements

Change-Id: I13d28b38d18492366df0d18d51aba266e9e1d4c7
Show MOS ISO file used for installation

Change-Id: I013544d19130a768e8ae96ce68a7821408537327
Fix epic problem with no_route_to_host

Change-Id: I9cd9a7f314a8a5d03821fadf1ef0d3f548861c93
Merge "Rename Savanna to Sahara in requirements"
Merge "Fix epic problem with no_route_to_host"
Merge "Show MOS ISO file used for installation"
Temporarily removing Sahara from requirements

Change-Id: I1b0f2dd43894e4a06bedc51ec82799f6904bda23
Delete Sahara requirements from deb

Change-Id: I4ea363cd0734b33f7a84050a7df0992e2155abf9
Use a new ruby 2.1 in the master node as a single ruby version

* remove unused gems;
* remove rbenv env;
* remove ruby compilation;
* use ruby 2.1 for master node.

TODO:
* remove raemon;
* remove build gems for Astute;
* update spec for Astute.

Change-Id: I099e65901ef3cf691f90d5bda4dd2f1a5cb76ea7
Implements: blueprint fuel-new-system-ruby-in-master-node