GCP: Move gcp-routes script and service into bootstrap data

[LorbusChris]

- What I did
This PR adds a script and service unit to the GCP templates that ensures GCP routes are set corrently.
These files are already baked into RHCOS by the build system, but we'd like to move them out of there and into installer (for bootstrap nodes) and MCO (for masters/workers).
The analogous MCO PR is openshift/machine-config-operator#1449

- How to verify it
CI

[LorbusChris]

@cgwalters @vrutkovs please review the second commit to make sure those changes are sane

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[abhinavdahiya]

/hold

I do not want the installer to maintain this script for GCP.

[LorbusChris]

This will probably be moved into afterburn for the FCOS case
/close

[openshift-ci-robot]

@LorbusChris: Closed this PR.

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In response to this:

This will probably be moved into afterburn
/close

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[openshift-ci-robot]

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

Test name	Commit	Details	Rerun command
ci/prow/e2e-libvirt	96c35e6	link	/test e2e-libvirt
ci/prow/e2e-openstack	96c35e6	link	/test e2e-openstack
ci/prow/e2e-aws-scaleup-rhel7	96c35e6	link	/test e2e-aws-scaleup-rhel7

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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