btrfs-progs: clean up commands.h

This function is declared in utils.h so remove it from commands.h int
test_issubvolume(const char *path);

This function does not exists delete the declaration
get_subvol_name(char *mnt, char *full_path);

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

commands.h

@@ -125,10 +125,4 @@ int cmd_dump_super(int argc, char **argv);
 int cmd_debug_tree(int argc, char **argv);
 int cmd_rescue(int argc, char **argv);
 
-/* subvolume exported functions */
-int test_issubvolume(const char *path);
-
-/* send.c */
-char *get_subvol_name(char *mnt, char *full_path);
-
 #endif