Update Rancher external-lb version

Udate the Rancher external-lb docker image version to 0.3.2 as the Avi
LB plugin is available from that version.

templates/avi/0/docker-compose.yml

@@ -1,5 +1,5 @@
 avi:
-  image: rancher/external-lb:v0.3.0
+  image: rancher/external-lb:v0.3.2
   command: -provider=Avi
   expose: 
    - 1000

templates/avi/0/rancher-compose.yml

@@ -1,6 +1,6 @@
 .catalog:
   name: Avi Vantange Platform Load Balancer
-  version: "v0.3.0-rancher1"
+  version: "v0.3.2-rancher1"
   description: "External LB service powered by Avi Vantage Platform"
   minimum_rancher_version: v1.1.0
   questions:

templates/avi/config.yml

@@ -1,5 +1,5 @@
 name: Avi Vantage Platform
 description: |
     External LB service powered by Avi Vantage Platform
-version: v0.3.0-rancher1
+version: v0.3.2-rancher1
 category: Load Balancing