unused aws instace and vpcs cleanup

Signed-off-by: shiva kumar <shivaku@nvidia.com>

Author: shivakunv

scripts/awsvpcscleanup.sh

@@ -47,7 +47,14 @@ route_tables=$(aws ec2 describe-route-tables \
     --output text | tr -d '\r' | tr '\n' ' ')
 for rt in $route_tables; do
     echo "Deleting route table: $rt"
-    aws ec2 disassociate-route-table --association-id "$rt"
+    associations=$(aws ec2 describe-route-tables \
+        --route-table-ids "$rt" \
+        --query "RouteTables[0].Associations[].RouteTableAssociationId" \
+        --output text | tr -d '\r' | tr '\n' ' ')   
+    for assoc in $associations; do
+        echo "Disassociating route table association: $assoc"
+        aws ec2 disassociate-route-table --association-id "$assoc"
+    done
     aws ec2 delete-route-table --route-table-id "$rt"
 done