filer: remove replication, collection, disk_type info from entry metadata

these metadata can change and are not used

other/java/client/src/main/proto/filer.proto

@@ -166,14 +166,11 @@ message FuseAttributes {
     uint32 gid = 5;
     int64 crtime = 6; // unix time in seconds
     string mime = 7;
-    string replication = 8;
-    string collection = 9;
     int32 ttl_sec = 10;
     string user_name = 11; // for hdfs
     repeated string group_name = 12; // for hdfs
     string symlink_target = 13;
     bytes md5 = 14;
-    string disk_type = 15;
     uint32 rdev = 16;
     uint64 inode = 17;
 }