AutoScaling tests updated to run with Groovy 1.7.2.
Remove copy of LinkedTransferQueue - EUCA-5740

Remove copy of LinkedTransferQueue, use the Java 7 version.

EUCA-5740
Add eucarc environment variables for access/secret key - EUCA-5642

Add AWS_ACCESS_KEY/AWS_SECRET_KEY environment variables.

EUCA-5642
Improve error message for IAM policy denials - EUCA-5790

IAM policy denials now reference the type, rather than the type
annotation.

EUCA-5790
Add unique constraint for security group identifiers - EUCA-5800

EUCA-5800
DescribeImages ExecutableBy parameter updated to match AWS - EUCA-4345

The behaviour of the ExecutableBy parameter for DescribeImages is
updated to match that of AWS.

Specified self and account ID values will no longer match when they are
the image owner, only when there is an explicit launch permission.

EUCA-4345
Merge bug fix branch to testing