Fixup apt module refactoring from previous patch.

library/apt

@@ -154,7 +154,7 @@ def install(m, pkgspec, cache, upgrade=False, default_release=None, install_reco
         else:
             force_yes = ''
 
-        cmd = "%s --option Dpkg::Options::=--force-confold -q -y %s install %s" % (APT_GET, force_yes, packages)
+        cmd = "%s --option Dpkg::Options::=--force-confold -q -y %s install %s" % (APT_GET_CMD, force_yes, packages)
         if default_release:
             cmd += " -t '%s'" % (default_release,)
         if not install_recommends:
@@ -185,7 +185,7 @@ def remove(m, pkgspec, cache, purge=False):
         purge = ''
         if purge:
             purge = '--purge'
-        cmd = "%s -q -y %s remove %s" % (APT_GET, purge,packages)
+        cmd = "%s -q -y %s remove %s" % (APT_GET_CMD, purge,packages)
 
         if m.check_mode:
             m.exit_json(changed=True)
@@ -234,7 +234,7 @@ def main():
             default_release = dict(default=None, aliases=['default-release']),
             install_recommends = dict(default='yes', aliases=['install-recommends'], type='bool'),
             force = dict(default='no', type='bool'),
-            upgrade = dict(default='yes', choices=['yes', 'safe', 'full', 'dist'])
+            upgrade = dict(choices=['yes', 'safe', 'full', 'dist'])
         ),
         mutually_exclusive = [['package', 'upgrade']],
         required_one_of = [['package', 'upgrade', 'update_cache']],