check: check modules in hgdemandimport

A few places only check modules in mercurial and hgext. Add
hgdemandimport to the list in those places.

contrib/check-py3-compat.py

@@ -51,9 +51,10 b' def check_compat_py3(f):'
         return
 
     # Try to import the module.
-    # For now we only support mercurial.* and hgext.* modules because figuring
-    # out module paths for things not in a package can be confusing.
-    if f.startswith(('hgext/', 'mercurial/')) and not f.endswith('__init__.py'):
+    # For now we only support modules in packages because figuring out module
+    # paths for things not in a package can be confusing.
+    if (f.startswith(('hgdemandimport/', 'hgext/', 'mercurial/'))
+        and not f.endswith('__init__.py')):
         assert f.endswith('.py')
         name = f.replace('/', '.')[:-3]
         try:

tests/test-check-help.t

@@ -23,6 +23,6 b''
 Check if ":hg:`help TOPIC`" is valid:
 (use "xargs -n1 -t" to see which help commands are executed)
 
-  $ hg files 'glob:{hgext,mercurial}/**/*.py' | sed 's|\\|/|g' \
+  $ hg files 'glob:{hgdemandimport,hgext,mercurial}/**/*.py' | sed 's|\\|/|g' \
   > | xargs python "$TESTTMP/scanhelptopics.py" \
   > | xargs -n1 hg help > /dev/null

tests/test-check-pylint.t

@@ -12,7 +12,7 b' Current checks:'
   $ touch $TESTTMP/fakerc
   $ pylint --rcfile=$TESTTMP/fakerc --disable=all \
   >   --enable=W0102 --reports=no \
-  >   mercurial hgext hgext3rd
+  >   mercurial hgdemandimport hgext hgext3rd
    (?)
   ------------------------------------ (?)
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