Wait for DB writes only on reads (causality checks)

[Akrog]

On PR 392 we changed to waiting on writes for updates and inserts, but upon further analysis we have decided that just doing it for reads should be enough, as the order of the updates will be reconciled automatically by the DB engine.

In this patch we change the value of mysql_wsrep_sync_wait to 1 to only wait on reads.

[zzzeek]

let's just try it. if we still have errors, we can try adding bits though i dont think that would be the issue even then, we want to see that errors go away with the "1" setting

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Akrog, zzzeek

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[openshift-ci]

@Akrog: The following test 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/cinder-operator-build-deploy-tempest	b074794	link	false	/test cinder-operator-build-deploy-tempest

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