ZF-8241: Create EC2 __construct() method in the abstract class to handle the regions


this is currently done in the Z_S_Amazon_Abstract constructor which the Ec2 extends so it would just need to set the region stuff and then pass to the parent constructor.


Not sure if this can be done yet as it may be fore the S3 stuff not the EC2 stuff. Will look into further.

This is part of ZF-8238