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Make "caCertSecretName" optional in external authService config

See original GitHub issue

When using an address space configuration with an external authentication service with a host for which there is a proper (not self-signed) certificate, it would be good to have the “caCertSecretName” configuration be optional. Meaning that in this case JRE / OS provided CA certs should be used for validation.

Currently, when omitting the “caCertSecretName” property, there is an exception about this property being required. With an empty property value, there is an internal exception later on:

2018-09-04 07:34:31 INFO  ControllerChain:109 - Check address spaces: [play:bosch, play:pg-hub-4463]
2018-09-04 07:34:31 WARN  ResourceChecker:53 - Exception in checker task
java.lang.IllegalArgumentException: Name must be provided.
	at io.fabric8.kubernetes.client.dsl.base.BaseOperation.withName(BaseOperation.java:255)
	at io.fabric8.kubernetes.client.dsl.base.BaseOperation.withName(BaseOperation.java:70)
	at io.enmasse.controller.common.KubernetesHelper.getSecret(KubernetesHelper.java:220)
	at io.enmasse.controller.TemplateInfraResourceFactory.lambda$createResourceList$1(TemplateInfraResourceFactory.java:51)
	at java.util.Optional.ifPresent(Optional.java:159)
	at io.enmasse.controller.TemplateInfraResourceFactory.createResourceList(TemplateInfraResourceFactory.java:51)
	at io.enmasse.controller.StatusController.isReady(StatusController.java:38)
	at io.enmasse.controller.StatusController.handle(StatusController.java:26)
	at io.enmasse.controller.ControllerChain.onUpdate(ControllerChain.java:120)
	at io.enmasse.k8s.api.ResourceChecker.doWork(ResourceChecker.java:48)
	at io.enmasse.k8s.api.ResourceChecker.run(ResourceChecker.java:40)
	at java.lang.Thread.run(Thread.java:748)