pkg/cvo/sync_worker: Demote "Status change: ..." logging to v6

This line is descended from 961873d (sync: Do config syncing in the
background, 2019-01-11, openshift#82).  But we triggered it recently with
88c222c (install/0000_00_cluster-version-operator_03_deployment:
Bump to --v=5, 2020-08-30, openshift#448).  Drop the line, because it's noisy
spew in the log files, with all of the small "fraction-completed"
bumps:

  $ grep -c 'sync_worker.go:.*Status change' namespaces/openshift-cluster-version/pods/cluster-version-operator-*/cluster-version-operator/cluster-version-operator/logs/current.log6265
  $ grep 'sync_worker.go:.*Status change' namespaces/openshift-cluster-version/pods/cluster-version-operator-*/cluster-version-operator/cluster-version-operator/logs/current.log | tail -n42020-10-09T18:21:53.523398340Z I1009 18:21:53.522733       1 sync_worker.go:458] Status change cvo.SyncWorkerStatus{Generation:1, Step:"ApplyResources", Failure:error(nil), Fraction:0.9936, Completed:0, Reconciling:true, Initial:false, VersionHash:"NtNVAdtksjk=", LastProgress:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}, Actual:v1.Release{Version:"4.7.0-0.ci.test-2020-10-09-171926-ci-op-8r50wp9l", Image:"registry.build01.ci.openshift.org/ci-op-8r50wp9l/release@sha256:9c90e64d7ccec7475608daf3e7a21ed749d047a330203734501eb7bc95c65ac8", URL:"", Channels:[]string(nil)}, Verified:false}
  2020-10-09T18:21:53.538399862Z I1009 18:21:53.537709       1 sync_worker.go:458] Status change cvo.SyncWorkerStatus{Generation:1, Step:"ApplyResources", Failure:error(nil), Fraction:0.9952, Completed:0, Reconciling:true, Initial:false, VersionHash:"NtNVAdtksjk=", LastProgress:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}, Actual:v1.Release{Version:"4.7.0-0.ci.test-2020-10-09-171926-ci-op-8r50wp9l", Image:"registry.build01.ci.openshift.org/ci-op-8r50wp9l/release@sha256:9c90e64d7ccec7475608daf3e7a21ed749d047a330203734501eb7bc95c65ac8", URL:"", Channels:[]string(nil)}, Verified:false}
  2020-10-09T18:21:53.570915921Z I1009 18:21:53.570847       1 sync_worker.go:458] Status change cvo.SyncWorkerStatus{Generation:1, Step:"ApplyResources", Failure:error(nil), Fraction:0.9984, Completed:0, Reconciling:true, Initial:false, VersionHash:"NtNVAdtksjk=", LastProgress:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}, Actual:v1.Release{Version:"4.7.0-0.ci.test-2020-10-09-171926-ci-op-8r50wp9l", Image:"registry.build01.ci.openshift.org/ci-op-8r50wp9l/release@sha256:9c90e64d7ccec7475608daf3e7a21ed749d047a330203734501eb7bc95c65ac8", URL:"", Channels:[]string(nil)}, Verified:false}
  2020-10-09T18:21:53.585933980Z I1009 18:21:53.585786       1 sync_worker.go:458] Status change cvo.SyncWorkerStatus{Generation:1, Step:"", Failure:error(nil), Fraction:1, Completed:10, Reconciling:true, Initial:false, VersionHash:"NtNVAdtksjk=", LastProgress:time.Time{wall:0xbfd8487062ea4a14, ext:2681032283239, loc:(*time.Location)(0x26b0400)}, Actual:v1.Release{Version:"4.7.0-0.ci.test-2020-10-09-171926-ci-op-8r50wp9l", Image:"registry.build01.ci.openshift.org/ci-op-8r50wp9l/release@sha256:9c90e64d7ccec7475608daf3e7a21ed749d047a330203734501eb7bc95c65ac8", URL:"", Channels:[]string(nil)}, Verified:false}

pkg/cvo/sync_worker.go

@@ -455,7 +455,7 @@ func (w *SyncWorker) updateStatus(update SyncWorkerStatus) {
 	w.lock.Lock()
 	defer w.lock.Unlock()
 
-	klog.V(5).Infof("Status change %#v", update)
+	klog.V(6).Infof("Status change %#v", update)
 	w.status = update
 	select {
 	case w.report <- update: