JCLOUDS-503 - Missing c3.large from AWSEC2HardwareSupplier

When a NodeMetadata object represents an instance type c3.large, the hardware id is null. This failure occurs because the AWSEC2HardwareSupplier has no reference to the method org.jclouds.ec2.compute.domain.EC2HardwareBuilder.c3_large.

https://issues.apache.org/jira/browse/JCLOUDS-503