policymanager: log metadata values we act on

This will help with troubleshooting issues where metadata is set
incorrectly.

BUG=b/370964671
TEST=presubmit
RELEASE_NOTE=Device policy manager now logs the metadata values that it
takes as input.

Change-Id: Ie21b59e6ecc841560d230f483437501e012d63e7

pkg/configfetcher/configfetcher.go

diff --git a/pkg/configfetcher/configfetcher.go b/pkg/configfetcher/configfetcher.go
index daf3de5..a0e0181 100644
--- a/pkg/configfetcher/configfetcher.go
+++ b/pkg/configfetcher/configfetcher.go
@@ -212,20 +212,25 @@
 func getCOSGCIConfigSetting(cosKey string, gciKey string, instanceMetadata map[string]string, projectMetadata map[string]string) (string, bool) {
 	value, ok := instanceMetadata[cosKey]
 	if ok {
+		glog.V(0).Infof("Found instance metadata key %q: value is %q", cosKey, value)
 		return value, ok
 	}
 	value, ok = instanceMetadata[gciKey]
 	if ok {
+		glog.V(0).Infof("Found instance metadata key %q: value is %q", gciKey, value)
 		return value, ok
 	}
 	value, ok = projectMetadata[cosKey]
 	if ok {
+		glog.V(0).Infof("Found project metadata key %q: value is %q", cosKey, value)
 		return value, ok
 	}
 	value, ok = projectMetadata[gciKey]
 	if ok {
+		glog.V(0).Infof("Found project metadata key %q: value is %q", gciKey, value)
 		return value, ok
 	}
+	glog.V(0).Infof("Did not find either %q or %q in metadata", cosKey, gciKey)
 	return "", false
 }