Clouds Ec2 Provider should return RunNodesException instead of AWSResponseException when create tag fails

[ahsankhanmail]

In the code 
https://github.com/jclouds/jclouds/blob/master/apis/ec2/src/main/java/org/jclouds/ec2/compute/EC2ComputeService.java#L151

If createNdoesInGroup fails to create a tag (addTagsAndNamesToInstancesInRegion 
fails), it currently returns AWSResponseException. The caller has no way to 
cleanup the the failed node as the exception doesn't have the node id field. It 
should return RunNodesException which has fields containing failed nodes. The 
caller can then remove such node and retry. To repro the issue try to create a 
node with name larger than 300 character, it will create nodes with empty name 
and possibly multiple of them if caller retries.

 @Override
   public Set<? extends NodeMetadata> createNodesInGroup(String group, int 
count, final Template template)
            throws RunNodesException {
      Set<? extends NodeMetadata> nodes = super.createNodesInGroup(group, 
count, template);
      String region = 
AWSUtils.getRegionFromLocationOrNull(template.getLocation());

      if (client.getTagApiForRegion(region).isPresent()) {
         Map<String, String> common = 
metadataAndTagsAsValuesOfEmptyString(template.getOptions());
         if (generateInstanceNames || !common.isEmpty() || 
!template.getOptions().getNodeNames().isEmpty()) {
            return addTagsAndNamesToInstancesInRegion(common, 
template.getOptions().getNodeNames(),
                    nodes, region, group);
         }
      }
      return nodes;
   }