Values of match fields for VLAN tag was wrong when I used AD-SAL OF plugin and tried to create a flow entry whose matched packets without VLAN tags.

I ran a controller with AD-SAL OF plugin, and used REST API of Flow Programmer service to install a flow entry which matched packets without VALN tag.
And I got the flow entry from a switch by using REST API of Statistics service.
However I saw the flow entry didn't have a match field for VLAN ID, but had a match field for VLAN PCP.

What I used
-----------
The latest code of controller project on 19th June, 2014.

$ git log -3 --oneline
6c5efc6 Merge "Prepare for security-related catalina/tomcat version updates"
1e672ce Prepare for security-related catalina/tomcat version updates
0d34210 Merge "CONTROLLER-436 CONTROLLER-432 - Enhance Restconf Swagger Documentation"

How to produce
--------------

1. Build a controller.
$ git clone https://git.opendaylight.org/gerrit/p/controller.git
$ cd controller
$ mvn clean install -DskipTests

2. Run the controller.
$ cd opendaylight/distribution/opendaylight/target/distribution.opendaylight-osgipackage/opendaylight/
$ ./run.sh

3. Run a Mininet.
$ sudo mn --controller=remote,192.168.60.180 --topo tree,1

4. Install a flow entry.
Use REST API of Flow Programmer service to install a flow entry which has DL_VLAN match field set to 0 which means that the flow entry matches packets without VLAN tag.

$ curl --user "admin":"admin" -H "Accept: application/json" -H \
"Content-type: application/json" -X PUT \
http://localhost:8080/controller/nb/v2/flowprogrammer/default/node/OF/00:00:00:00:00:00:00:01/staticFlow/flow1 \
-d '{"installInHw":"true", "name":"flow1", "node":

, "priority":"0", "vlanId":"0","actions":["DROP"]}'

5. Check the flow entry in Mininet console.
mininet> dpctl dump-flows

• • • s1 ------------------------------------------------------------------------
      NXST_FLOW reply (xid=0x4):
      cookie=0x0, duration=8.121s, table=0, n_packets=0, n_bytes=0, idle_age=8, priority=0,vlan_tci=0x0000 actions=drop

6. Get the flow entry from the Mininet.

$ curl --user "admin":"admin" -H "Accept: application/json" -H \
"Content-type: application/json" -X GET \
http://localhost:8080/controller/nb/v2/statistics/default/flow

This GET request must return the flow entry which has DL_VLAN match field set to 0.
However, the flow entry I saw didn't have DL_VLAN field, but had DL_VLAN_PR field set to 0.

{
"flowStatistics": [
{
"flowStatistic": [
{
"byteCount": 0,
"durationNanoseconds": 472000000,
"durationSeconds": 29,
"flow": {
"actions": [

],
"hardTimeout": 0,
"id": 0,
"idleTimeout": 0,
"match": {
"matchField": [

]
},
"priority": 0
},
"packetCount": 0,
"tableId": 0
}
],
"node":

}
]
}