operator install: honor operatorframework.io/suggested-namespace

[joelanford]

Description: Updates kubectl operator install to honor CSVs that provide an operatorframework.io/suggested-namespace annotation.

Motivation: Closes #50

/hold I can't find any upstream documentation for operatorframework.io/suggested-namespace, so I'm somewhat concerned that we're adding support for a downstream feature. There's nothing actually OpenShift-specific with this annotation other than that OpenShift Console is the only current client that supports it. I think this would be as simple as a doc change to upstream OLM docs that specifies this annotation and describes what clients should do when it's present.

Downstream enhancement describes this annotation here: https://github.com/openshift/enhancements/blob/master/enhancements/olm/olm-managed-operator-metrics.md#fulfilling-namespace-and-rbac-requirements

[openshift-ci[bot]]

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[openshift-merge-robot]

@joelanford: PR needs rebase.

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[perdasilva]

closing due to inactivity - please re-open if needed ^^