When comparing services to determine whether an update is required, treat
implicit and explicit default values as equal.

Before this commit, the update logic would keep trying to revert the
default value that the API set for the service's session affinity or type.

This commit fixes part of bug 1842741.

https://bugzilla.redhat.com/show_bug.cgi?id=1842741

* pkg/operator/controller/controller_dns_service.go (serviceChanged): Use
the new cmpServiceAffinity and cmpServiceType functions so that two
services are considered equal if the only difference between them is that
one does not specify the session affinity or type and the other service has
the default values.
(cmpServiceAffinity, cmpServiceType): New function.
* pkg/operator/controller/controller_dns_service_test.go
(TestDNSServiceChanged): Verify that serviceChanged returns false if the
only mutation is that the session affinity or type has been updated from
empty to the default value.

When comparing daemonsets to determine whether an update is required, treat
implicit and explicit default values as equal.

Before this commit, the update logic would keep trying to revert the
default value that the API set for a volume's default mode.

This commit fixes part of bug 1842741.

https://bugzilla.redhat.com/show_bug.cgi?id=1842741

* pkg/operator/controller/controller_dns_daemonset.go
(daemonsetConfigChanged): Use the new cmpConfigMapVolumeSource and
cmpSecretVolumeSource functions so that two daemonsets are considered equal
if the only difference between them is that one does not specify a default
mode value and the other daemonset specifies the default value.
(volumeDefaultMode): New constant with the default mode that the API uses
for configmap and secret volume sources.
(cmpConfigMapVolumeSource, cmpSecretVolumeSource): New functions.
* pkg/operator/controller/controller_dns_daemonset_test.go
(TestDaemonsetConfigChanged): Verify that daemonsetConfigChanged returns
false if the only mutation is that a volume's default mode value has been
updated from empty to the default value.