Added security group rules for server

Added a new resource "server_security_group" for adding the security rules to server.
Added the property "security_groups" for each servers.
Now able to ping the created server with its floating IP.

Change-Id: Ic801d9fc6c933f022cc0997a69a96fcc68057ba9
Implements: security group rule
Closes-Bug: #1309082
Merge "Added security group rules for server"