remove greenlib depenencies, and squelch exceptions in switch_out

eventlet/backdoor.py

@@ -28,7 +28,6 @@ THE SOFTWARE.
 import socket
 import sys
 from code import InteractiveConsole
-from eventlet import greenlib
 
 from eventlet import api
 from eventlet.support import greenlets

eventlet/hubs/hub.py

@@ -123,7 +123,10 @@ class BaseHub(object):
         cur = greenlet.getcurrent()
         switch_out = getattr(cur, 'switch_out', None)
         if switch_out is not None:
+            try:
                 switch_out()
+            except:
+                traceback.print_exception(*sys.exc_info())
         if self.greenlet.dead:
             self.greenlet = greenlet.greenlet(self.run)
         try:

eventlet/hubs/libevent.py

@@ -29,7 +29,6 @@ import errno
 import traceback
 import time
 
-from eventlet import greenlib
 from eventlet.timer import Timer
 from eventlet.hubs import hub
 

eventlet/util.py

@@ -49,8 +49,7 @@ except ImportError:
 def g_log(*args):
     import sys
     from eventlet.support import greenlets as greenlet
-    from eventlet.greenlib import greenlet_id
-    g_id = greenlet_id()
+    g_id = id(greenlet.getcurrent())
     if g_id is None:
         if greenlet.getcurrent().parent is None:
             ident = 'greenlet-main'