tests/test-debugrename.t

resolve: report no argument warning using a hint

With this change resolve and revert produce consistent output when run with no
arguments:

$ hg resolve
abort: no files or directories specified
(use --all to remerge all files)

$ hg revert
abort: no files or directories specified
(use --all to revert all files)

  $ hg init
  $ echo a > a
  $ hg ci -Am t
  adding a

  $ hg mv a b
  $ hg ci -Am t1
  $ hg debugrename b
  b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3

  $ hg mv b a
  $ hg ci -Am t2
  $ hg debugrename a
  a renamed from b:37d9b5d994eab34eda9c16b195ace52c7b129980

  $ hg debugrename --rev 1 b
  b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3