demandimport: delete demandimportpy2 module

We no longer support Python 2.

Differential Revision: https://phab.mercurial-scm.org/D12353

hgdemandimport/__init__.py

@@ -15,10 +15,7 b''
 import os
 import sys
 
-if sys.version_info[0] >= 3:
-    from . import demandimportpy3 as demandimport
-else:
-    from . import demandimportpy2 as demandimport
+from . import demandimportpy3 as demandimport
 
 # Full module names which can't be lazy imported.
 # Extensions can add to this set.

tests/test-check-py3-compat.t

@@ -4,7 +4,6 b''
   $ cd "$TESTDIR"/..
 
   $ testrepohg files 'set:(**.py) - grep(pygments)' \
-  > -X hgdemandimport/demandimportpy2.py \
   > -X hgext/fsmonitor/pywatchman \
   > -X mercurial/cffi \
   > -X mercurial/thirdparty \