Prometheus-operator test is flaky

[lblackstone]

Problem description

The prometheus-operator test fails sporadically because the ServiceMonitor CR is being created prior to the relevant CRD. It appears that the CRD is created by the operator, so it's likely that we'll need to introduce a custom wait condition to make sure it's ready to go.

Errors & Logs

kubernetes:monitoring.coreos.com:ServiceMonitor my-monitoring creating Retry #0; creation failed: no matches for kind "ServiceMonitor" in version "monitoring.coreos.com/v1"
...
error: creation of resource my-monitoring-tqi58mhq failed because the Kubernetes API server reported that the apiVersion for this resource does not exist. Verify that any required CRDs have been created: no matches for kind "ServiceMonitor" in version "monitoring.coreos.com/v1"

Affected product version(s)

Reproducing the issue

Suggestions for a fix