Fix custom host role verbs

[tnozicka]

What type of PR is this? /kind bug

What this PR does / why we need it: non-existing permission lead to failure to create the role

Which issue(s) this PR fixes: Fixes https://github.com/tnozicka/openshift-acme/issues/109

Does this PR introduce a user-facing change?:

NONE

[openshift-ci-robot]

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[tnozicka]

/retest

[LorbusChris]

/retest

[LorbusChris]

looks like the update verb has to be removed as well:

 Error from server (Forbidden): error when creating "deploy/single-namespace/role.yaml": roles.rbac.authorization.k8s.io "openshift-acme" is forbidden: user "developer" (groups=["system:authenticated:oauth" "system:authenticated"]) is attempting to grant RBAC permissions not currently held:
{APIGroups:["route.openshift.io"], Resources:["routes/custom-host"], Verbs:["update"]} 

[tnozicka]

I think that's a bug in OCP bootstrap policy, I saw update being checked in ingress admission. Need to look into it next week. I suppose I can ship it with only create for now.

[openshift-ci-robot]

@tnozicka: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-specific-namespaces	2cfefc7388102408a334ada90933531c7e5e11c2	link	/test e2e-specific-namespaces

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