tests/test-hgrc.out

Use StatusEntry class instead of repeated status line parsing.

This small cleanup abstracts out repeated instances of
(rev, name) = applied[x].split(':'), making it easier to use
applied or change the status file format.

abort: Failed to parse .../t/.hg/hgrc
File contains no section headers.
file: .../t/.hg/hgrc, line: 1
'invalid\n'