tests: add glob matching for unified tests
This adds a " (glob)" marker that works like a simpler version of
(re): "*" is converted to ".*", and "?" is converted to ".".
Both special characters can be escaped using "\", and the backslash
itself can be escaped as well.
Other glob-style syntax, like "**", "[chars]", or "[!chars]", isn't
supported.
$ hg init outer
$ cd outer
hg debugsub with no remapping
$ echo 'sub = http://example.net/libfoo' > .hgsub
$ hg add .hgsub
$ hg debugsub
path sub
source http://example.net/libfoo
revision
hg debugsub with remapping
$ echo '[subpaths]' > .hg/hgrc
$ printf 'http://example.net/lib(.*) = C:\\libs\\\\1-lib\\\n' >> .hg/hgrc
$ hg debugsub
path sub
source C:\libs\foo-lib\
revision
test bad subpaths pattern
$ cat > .hg/hgrc <<EOF
> [subpaths]
> .* = \1
> EOF
$ hg debugsub
abort: bad subrepository pattern in */test-subrepo-paths.t/outer/.hg/hgrc:2: invalid group reference (glob)
[255]