mtest: rust: allow parsing doctest output

Doctests have a slightly different output compared to what "protocol: rust"
supports:

  running 2 tests
  test ../doctest1.rs - my_func (line 7) ... ignored
  test ../doctest1.rs - (line 3) ... ok

  test result: ok. 1 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.12s

Add a little more parsing in order to accept this; a simple minded split()
fails to unpack the tuple.  I plan to contribute an extension of the rust
module to invoke doctests, for now this allows running rustdoc --test with
"protocol: 'rust'" and get information about the subtests:

  ▶ 4/8 ../doctest1.rs:my_func:7                     SKIP
  ▶ 4/8 ../doctest1.rs:3                             OK
  4/8 rust_unit_tests:doctests / rust doctest        OK              0.28s   1 subtests passed

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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