[AWS|EC2] request_spot_instances.rb requires that date parameters be iso8601
Fix subnet mocking, related to #2510
Merge pull request #2518 from drcapulet/master

Fix subnet mocking, related to #2510
Merge pull request #2514 from fcheung/request_spot_instances_time_coercion

[AWS|EC2] request_spot_instances.rb requires that date parameters be iso...
Merge pull request #2520 from engineyard/aws_block_device_mapping

[aws] mock block device mapping on run_instances
Merge pull request #2522 from engineyard/aws_block_device_mapping

[aws] mock setup block device deleteOnTermination