change maxUnavailable and MaxSurge to use percentages as opposed to int

[HVBE]

Description

Fixes the rolling update strategy,
The grafana web UI should no longer return 503's when resources are added to the grafana instance

Relevant issues/tickets

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• This change requires a documentation update
• I have added tests that prove my fix is effective or that my feature works
• I have added a test case that will be used to verify my changes
• Verified independently on a cluster by reviewer

Verification steps

• Check out the master branch
• Run the operator and open the web UI presented through the ingress/route
• add datasources from deploy/examples/datasources
• The web UI should return 503
• Restart the operator from this branch
• add more datasources, the web UI should no longer return 503's while the operator adds datasources

[HVBE]

/closes #381

[HVBE]

@pb82 when you can, have a quick look at this, I think it should fix the 503 between grafana restarts

[HVBE]

/retest

[openshift-ci]

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

Test name	Commit	Details	Rerun command
ci/prow/format	40adcb2	link	/test format
ci/prow/images	40adcb2	link	/test images
ci/prow/e2e	40adcb2	link	/test e2e
ci/prow/unit	40adcb2	link	/test unit

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[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pb82

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[pb82]

CI failing because an image can't be pulled. Going to merge this manually, the change should be safe.