jicofo: fix boolean values in configuration file

A type error is thrown when one of these environment variables is
defined:
- ENABLE_AUTO_OWNER
- JICOFO_ENABLE_HEALTH_CHECKS
- JICOFO_ENABLE_BRIDGE_HEALTH_CHECKS

jicofo/rootfs/defaults/jicofo.conf

@@ -47,7 +47,7 @@ jicofo {
 
       {{ if .Env.JICOFO_ENABLE_BRIDGE_HEALTH_CHECKS }}
       health-checks {
-        enabled = "{{ .Env.JICOFO_ENABLE_BRIDGE_HEALTH_CHECKS }}"
+        enabled = {{ .Env.JICOFO_ENABLE_BRIDGE_HEALTH_CHECKS | toBool }}
       }
       {{ end }}
 
@@ -76,7 +76,7 @@ jicofo {
 
     conference {
       {{ if .Env.ENABLE_AUTO_OWNER }}
-      enable-auto-owner = "{{ .Env.ENABLE_AUTO_OWNER }}"
+      enable-auto-owner = {{ .Env.ENABLE_AUTO_OWNER | toBool }}
       {{ end }}
 
       {{ if .Env.JICOFO_CONF_INITIAL_PARTICIPANT_WAIT_TIMEOUT }}
@@ -92,7 +92,7 @@ jicofo {
     // Configuration for the internal health checks performed by jicofo.
     health {
       // Whether to perform health checks.
-      enabled = "{{ .Env.JICOFO_ENABLE_HEALTH_CHECKS }}"
+      enabled = {{ .Env.JICOFO_ENABLE_HEALTH_CHECKS | toBool }}
     }
     {{ end }}