Don't hardcode region in alarm call

Author: bethac07

worker/run-worker.sh

@@ -21,7 +21,7 @@ mkdir -p /home/ubuntu/local_output
 stdbuf -o0 s3fs $AWS_BUCKET /home/ubuntu/bucket -o passwd_file=/credentials.txt 
 
 # 3. SET UP ALARMS
-aws cloudwatch put-metric-alarm --alarm-name ${APP_NAME}_${MY_INSTANCE_ID} --alarm-actions arn:aws:swf:us-east-1:${OWNER_ID}:action/actions/AWS_EC2.InstanceId.Terminate/1.0 --statistic Maximum --period 60 --threshold 1 --comparison-operator LessThanThreshold --metric-name CPUUtilization --namespace AWS/EC2 --evaluation-periods 15 --dimensions "Name=InstanceId,Value=${MY_INSTANCE_ID}" 
+aws cloudwatch put-metric-alarm --alarm-name ${APP_NAME}_${MY_INSTANCE_ID} --alarm-actions arn:aws:swf:${AWS_REGION}:${OWNER_ID}:action/actions/AWS_EC2.InstanceId.Terminate/1.0 --statistic Maximum --period 60 --threshold 1 --comparison-operator LessThanThreshold --metric-name CPUUtilization --namespace AWS/EC2 --evaluation-periods 15 --dimensions "Name=InstanceId,Value=${MY_INSTANCE_ID}" 
 
 # 4. RUN VM STAT MONITOR