tests/test-check-pylint.t

hg: don't attempt to extend `sys.path` with the user site without `APPDATA`

This variable is created by the system and *should* be available, but
test-lfs-bundle.t has a test where it is explicitly unset.  It wasn't caught
before because prior to 95af358fcdfe, it was limited to the py2exe binary.  As a
precaution, fix both that and the pyoxidizer case that was causing the test to
fail.

Differential Revision: https://phab.mercurial-scm.org/D11354

#require test-repo pylint hg10

Run pylint for known rules we care about.
-----------------------------------------

There should be no recorded failures; fix the codebase before introducing a
new check.

Current checks:
- W0102: no mutable default argument

  $ touch $TESTTMP/fakerc
  $ pylint --rcfile=$TESTTMP/fakerc --disable=all \
  >   --enable=W0102,C0321 \
  >   --reports=no \
  >   --ignore=thirdparty \
  >   mercurial hgdemandimport hgext hgext3rd | sed 's/\r$//'
  Using config file *fakerc (glob) (?)
   (?)
  ------------------------------------* (glob) (?)
  Your code has been rated at 10.00/10* (glob) (?)
   (?)