Update vold to log only debug or higher level messages.

This will allow adding lots of verbose logs which can be enabled
only during local testing/debugging. Update the existing verbose
level logs to debug level since we want those to be logged by
default.

Test: manual
Change-Id: Ib05e2b6efa71308458d49affb6ed81d3975b28ab
diff --git a/Loop.cpp b/Loop.cpp
index 92f1e97..4926ea8 100644
--- a/Loop.cpp
+++ b/Loop.cpp
@@ -146,7 +146,7 @@
                 PLOG(WARNING) << "Failed to LOOP_CLR_FD " << path;
             }
         } else {
-            LOG(VERBOSE) << "Found unmanaged loop device at " << path << " named " << id;
+            LOG(DEBUG) << "Found unmanaged loop device at " << path << " named " << id;
         }
     }