Do not specify hostportslist when update strategy is rolling update

We should not specify a default value for host ports list as the attribute is not allowed when update strategy is rolling update which is the default.

Closes truenas/charts#6

test/ix-chart/2010.0.2/values.yaml

@@ -20,7 +20,6 @@ containerEnvironmentVariables: []
 # Network related configuration
 externalInterfaces: []
 portForwardingList: []
-hostPortsList: []
 hostNetwork: false
 dnsPolicy: Default
 dnsConfig: