bitbake: For poky only, force the use of fetch2 codebase

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/__init__.py

@@ -78,7 +78,7 @@ if "BBDEBUG" in os.environ:
     if level:
         bb.msg.set_debug_level(level)
 
-if os.environ.get("BBFETCH2"):
+if True or os.environ.get("BBFETCH2"):
     from bb import fetch2 as fetch
     sys.modules['bb.fetch'] = sys.modules['bb.fetch2']