Use version 3 in the test

CNI_VERSION env var was never used, so removed from the test script.
The second test is crashing on v1, so bumped to v3.

test/830_cni_plugin_test.sh

@@ -7,7 +7,7 @@ start_suite "Test CNI plugin"
 cni_connect() {
     pid=$(container_pid $1 $2)
     id=$(docker_on $1 inspect -f '{{.Id}}' $2)
-    run_on $1 sudo CNI_VERSION=1 CNI_COMMAND=ADD CNI_CONTAINERID=$id CNI_IFNAME=eth0 \
+    run_on $1 sudo CNI_COMMAND=ADD CNI_CONTAINERID=$id CNI_IFNAME=eth0 \
     CNI_NETNS=/proc/$pid/ns/net CNI_PATH=/opt/cni/bin /opt/cni/bin/weave-net 
 }
 
@@ -30,6 +30,7 @@ EOF
 
 cni_connect $HOST1 c2 <<EOF
 {
+    "cniVersion": "0.3.0",
     "name": "weave",
     "type": "weave-net",
     "ipam": {