Add integration test for installer testing

[jhixson74]

Integration test

Requires setting environmental variables
To test, cd pkg/installer && go test -tags=aro

Generates ignition files & manifests

[openshift-ci]

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[jhixson74]

/cc @patrickdillon @zaneb

[zaneb]

I think this needs to go in a separate file and be protected by an explicit build tag (like e.g. // +build integration), since this can't ever pass in CI.

[openshift-ci]

@jhixson74: 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/unit	9ee4c62	link	true	/test unit
ci/prow/lint	9ee4c62	link	true	/test lint
ci/prow/validate	9ee4c62	link	true	/test validate
ci/prow/vendor	9ee4c62	link	true	/test vendor

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