Force bundled_imaplib2

I am forcing to use the bundled. I will modify this library
to make it similar to imaplib2 for python3

offlineimap/virtual_imaplib2.py

@@ -1,52 +1,7 @@
-# Copyright (C) 2016-2016 Nicolas Sebrecht & contributors
-#
-#    This program is free software; you can redistribute it and/or modify
-#    it under the terms of the GNU General Public License as published by
-#    the Free Software Foundation; either version 2 of the License, or
-#    (at your option) any later version.
-#
-#    This program is distributed in the hope that it will be useful,
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#    GNU General Public License for more details.
-#
-#    You should have received a copy of the GNU General Public License
-#    along with this program; if not, write to the Free Software
-#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+from offlineimap.bundled_imaplib2 import *
+import offlineimap.bundled_imaplib2 as imaplib
 
-"""
-
-The virtual imaplib2 takes care to import the correct imaplib2 library. Any
-internal use of imaplib2 everywhere else in offlineimap must be done through
-this virtual_imaplib2 or we might go into troubles.
-
-"""
-
-DESC = None
-
-_SUPPORTED_RELEASE = 2
-_SUPPORTED_REVISION = 57
-
-try:
-    # Try any imaplib2 in PYTHONPATH first. This allows both maintainers of
-    # distributions and developers to not work with the bundled imaplib2.
-    from imaplib2 import *
-    import imaplib2 as imaplib
-
-    if (int(imaplib.__release__) < _SUPPORTED_RELEASE or
-            int(imaplib.__revision__) < _SUPPORTED_REVISION):
-        raise ImportError("The provided imaplib2 version '%s' is not supported"%
-            imaplib.__version__)
-    DESC = "system"
-except (ImportError, NameError) as e:
-    try:
-        from offlineimap.bundled_imaplib2 import *
-        import offlineimap.bundled_imaplib2 as imaplib
-
-        DESC = "bundled"
-    except:
-        print("Error while trying to import system imaplib2: %s"% e)
-        raise
+DESC = "bundled"
 
 # Upstream won't expose those literals to avoid erasing them with "import *" in
 # case they exist.