Use separate image for route controller manager

[csrwng]

What this PR does / why we need it:
The route controller manager was recently separated into its own image and is no longer a subcommand of openshift-controller-manager. This change switches to using the separate route-controller-manager image and adjusts the deployment for it accordingly.

Checklist

• Subject and description added to both, commit and PR.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csrwng

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[csrwng]

Ref: openshift/openshift-controller-manager#240

[yuqi-zhang]

/test e2e-aws

[openshift-ci]

@csrwng: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/capi-provider-agent-sanity	84b09a2	link	false	/test capi-provider-agent-sanity
ci/prow/kubevirt-e2e-kubevirt-azure-ovn	84b09a2	link	false	/test kubevirt-e2e-kubevirt-azure-ovn
ci/prow/e2e-ibmcloud-roks	84b09a2	link	false	/test e2e-ibmcloud-roks
ci/prow/kubevirt-e2e-kubevirt-gcp-ovn	84b09a2	link	false	/test kubevirt-e2e-kubevirt-gcp-ovn
ci/prow/e2e-ibmcloud-iks	84b09a2	link	false	/test e2e-ibmcloud-iks

Full PR test history. Your PR dashboard.

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[jparrill]

/lgtm