test: fix self._testdir to use the right mercurial library during testing
Currently if you run tests from some other directory other than the
`../tests/`, you will get a warning stating
```
warning: Testing with unexpected mercurial lib: mercurial
(expected /tmp/hgtests.xxxxxx/install/lib/python/mercurial)
```
This is because the current directory being added to the 'PATH', if the
`self._testdir != runtestdir`, owing to this line
```
if self._testdir != runtestdir:
path = [self._testdir] + path
```
Also say you ran the tests from the hg base directory,
because directory is being added in the PATH (see the above snippet, at
that stage the `self._testdir` has the value as `cwd`, owing to a faulty
initialization). And since the current directory already has the 'hg',
that is used in place of the hg that is installed for the testing purposes
in `/tmp/hgtests.xxxxxx/...`.
Differential Revision: https://phab.mercurial-scm.org/D5199
#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also https://mercurial-scm.org/wiki/PublishingRepositories
# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"
# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
#import sys; sys.path.insert(0, "/path/to/python/lib")
# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()
from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)