Add disableaddrchecks command (to allow network labs on AWS)

prepare-vms/lib/commands.sh

@@ -314,6 +314,14 @@ _cmd_opensg() {
     infra_opensg
 }
 
+_cmd disableaddrchecks "Disable source/destination IP address checks"
+_cmd_disableaddrchecks() {
+    TAG=$1
+    need_tag
+
+    infra_disableaddrchecks
+}
+
 _cmd pssh "Run an arbitrary command on all nodes"
 _cmd_pssh() {
     TAG=$1

prepare-vms/lib/infra.sh

@@ -24,3 +24,7 @@ infra_quotas() {
 infra_opensg() {
 	warning "infra_opensg is unsupported on $INFRACLASS."
 }
+
+infra_disableaddrchecks() {
+	warning "infra_disableaddrchecks is unsupported on $INFRACLASS."
+}

prepare-vms/lib/infra/aws.sh

@@ -88,6 +88,14 @@ infra_opensg() {
         --cidr 0.0.0.0/0
 }
 
+infra_disableaddrchecks() {
+    IDS=$(aws_get_instance_ids_by_tag $TAG)
+    for ID in $IDS; do
+        info "Disabling source/destination IP checks on: $ID"
+        aws ec2 modify-instance-attribute --source-dest-check "{\"Value\": false}" --instance-id $ID
+    done
+}
+
 wait_until_tag_is_running() {
     max_retry=50
     i=0