Allow ec2_tag module to print the tags of an instance

##### Issue Type:
Feature Pull Request

##### Ansible Version:
ansible 1.6 (devel 435104065e) last updated 2014/03/04 11:07:56 (GMT +1000)

##### Environment:
N/A

##### Summary:

Use the print argument to state to just collect the tags of a resource through the AWS API. This allows the extraction of tags information without connecting to the resource itself.

The intention is then to use this information in further tasks.

##### Steps To Reproduce:

##### Expected Results:

##### Actual Results: