Missing load balancer health monitors fix

In api and etcd load balancer templates we define if Octavia
load balancer healthchecks should be enabled. Corrected
octavia_lb_healthcheck parameter value comparison.

Closes-bug: #2015393
Change-Id: Icee8be92ea3e3121934645049b81b79be9bd046a
(cherry picked from commit f2dc768)

Author: darmach

magnum/drivers/common/templates/lb_api.yaml

@@ -13,7 +13,7 @@ conditions:
   octavia_lb_healthcheck_enabled:
       equals:
       - get_param: octavia_lb_healthcheck
-      - []
+      - True
 
 parameters:
 

magnum/drivers/common/templates/lb_etcd.yaml

@@ -14,7 +14,7 @@ conditions:
   octavia_lb_healthcheck_enabled:
       equals:
       - get_param: octavia_lb_healthcheck
-      - []
+      - True
 
 parameters: