HADOOP-15772. Remove the 'Path ... should be specified as a URI' warnings on startup. Contributed by Ayush Saxena.

(cherry picked from commit 2eb597b151)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Util.java

@@ -96,8 +96,7 @@ public final class Util {
 
     // if URI is null or scheme is undefined, then assume it's file://
     if(u == null || u.getScheme() == null){
-      LOG.warn("Path " + s + " should be specified as a URI "
-          + "in configuration files. Please update hdfs configuration.");
+      LOG.info("Assuming 'file' scheme for path " + s + " in configuration.");
       u = fileAsURI(new File(s));
     }
     return u;