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

requirements-gems.txt

@@ -1,4 +1,3 @@
-activerecord 3.0.10
 amq-client 0.9.12
 amq-protocol 1.2.0
 amqp 0.9.10
@@ -12,7 +11,6 @@ i18n 0.5.0
 ipaddress 0.8.0
 json 1.6.1
 json_pure 1.7.5
-kwalify 0.7.2
 mcollective-client 2.4.1
 mime-types 1.19
 mixlib-authentication 1.1.4
@@ -20,15 +18,12 @@ mixlib-cli 1.2.2
 mixlib-config 1.1.2
 mixlib-log 1.4.1
 mixlib-shellout 1.0.0
-moneta 0.6.0
-mysql 2.8.1
 net-ssh 2.8.0
 net-ssh-gateway 1.1.0
 net-ssh-multi 1.1
 ohai 6.14.0
 polyglot 0.3.3
 popen4 0.1.2
-rails 3.0.10
 rest-client 1.6.7
 rethtool 0.0.3
 stomp 1.2.16