[release-4.18] Only use gateway PE IP for installer purposes if gateway is enabled

[openshift-cherrypick-robot]

This is an automated cherry-pick of #434

/assign kimorris27

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@openshift-cherrypick-robot: 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/validate	0ea46a2	link	true	/test validate
ci/prow/unit	0ea46a2	link	true	/test unit
ci/prow/lint	0ea46a2	link	true	/test lint

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[kimorris27]

Closing - going to do my own manual cherry pick to resolve the unit test issues.