Remove duplicate AUTH_URL parameter

Removed duplicate AUTH_URL parameter from write-heat-params in:
 - common kubernetes
 - k8s_coreos

Change-Id: Ice969e52af92f198fa5e4c69738c7c0a6c4d9308

magnum/drivers/common/templates/kubernetes/fragments/write-heat-params.yaml

@@ -40,5 +40,4 @@ write_files:
       TRUSTEE_PASSWORD="$TRUSTEE_PASSWORD"
       TRUSTEE_DOMAIN_ID="$TRUSTEE_DOMAIN_ID"
       TRUST_ID="$TRUST_ID"
-      AUTH_URL="$AUTH_URL"
       INSECURE_REGISTRY_URL="$INSECURE_REGISTRY_URL"

magnum/drivers/k8s_coreos_v1/templates/fragments/write-heat-params.yaml

@@ -39,5 +39,4 @@ write_files:
       TRUSTEE_PASSWORD="$TRUSTEE_PASSWORD"
       TRUSTEE_DOMAIN_ID="$TRUSTEE_DOMAIN_ID"
       TRUST_ID="$TRUST_ID"
-      AUTH_URL="$AUTH_URL"
       INSECURE_REGISTRY_URL="$INSECURE_REGISTRY_URL"