EC2 now allows use of sdb for volume attachments - EUCA-8693

EUCA-8693
Improve EC2 run instances invalid instance profile errors - EUCA-6411

EUCA-6411
Merge remote-tracking branch 'origin/dev/sjones/EUCA-6411' into testing
Merge remote-tracking branch 'origin/dev/sjones/EUCA-8693' into testing