Add .idea pattern to .gitignore
Add .idea pattern to .gitignore

The .idea directoy is used by pycharm and should not be included
in the change list. The change extends the .gitignore file to
avoid .idea directory to be shown in the change list.

Change-Id: I31cf4180accb262cf7a851d9c6ed927c61bc9ca5

openstack/ec2-api,stackforge/ec2-api,stackforge/ec2-api,openstack/ec2-api