btrfs: balance: print to system log when balance ends or is paused

Print a kernel log message when the balance ends, either for cancel or
completed or if it is paused.

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