Upgrade to operator-sdk v0.16.2

[grdryn]

Followed upgrade guide at:
https://sdk.operatorframework.io/docs/migration/version-upgrade-guide/#v016x

The reason I didn't go all the way to the latest 0.18.z is that after
0.16.z there were dependency conflicts that might best be solved by
either updating dependencies in openshift/operator-custom-metrics, or
by removing that as a dependency from this operator.

[grdryn]

/cc @RiRa12621

^since this was suggested at https://github.com/openshift/pagerduty-operator/pull/90/files#r448467970

[RiRa12621]

/ok-to-test

[grdryn]

Bump! Tests pass at least 🙂

[RiRa12621]

/lgtm
/assign @jewzaam

[jewzaam]

Discussed with the team and we agree this is a Good Thing. But not on a Friday. I'm on PTO next week but will approve and put on hold for deployment and testing in int/stage (side effect of merging this) next week.

/hold

[jewzaam]

/approve

cc @jharrington22

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grdryn, jewzaam, RiRa12621

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[RiRa12621]

@jewzaam We could just merge this as it's going int and stage only without the promotion to prod, shouldn't be a big deal even on Friday or weekend
Cc @jharrington22

[RiRa12621]

/unhold

[grdryn]

Thanks @RiRa12621, I'll rebase my other PR now on top of the new master, which should make it much smaller. 👍