Fixes #4710, #2270 - Wait for VM to become ready before looking for IPs

Fixes #4616 - Add a Fog mixin for looking up EC2 IP addresses

fixes #3178 - add feature for compute profiles for hostgroups and hosts

fixes #1871, #1879 - add VPC support to EC2 compute resource

Based on patch from Romain Vrignaud <romain@yakaz.com>

fixes #2411 - move lib/audit_extensions lib/fog_extensions lib/foreman to models/concerns

fixes #2739 - add ActiveSupport::Concern syntax to mixins