fix crash on fork with OSX Python meterpreter using SystemConfiguration

Calling into SystemConfiguration before forking seems to allow the child
process to use it without a null pointer dereference.

Author: Brent Cook

data/meterpreter/meterpreter.py

@@ -22,6 +22,7 @@
 # this MUST be imported for urllib to work on OSX
 try:
 	import SystemConfiguration as osxsc
+	osxsc.SCNetworkInterfaceCopyAll()
 	has_osxsc = True
 except ImportError:
 	has_osxsc = False
@@ -749,7 +750,7 @@ def create_response(self, request):
 		resp = struct.pack('>I', len(resp) + 4) + resp
 		return resp
 
-if not hasattr(os, 'fork') or has_osxsc or (hasattr(os, 'fork') and os.fork() == 0):
+if not hasattr(os, 'fork') or (hasattr(os, 'fork') and os.fork() == 0):
 	if hasattr(os, 'setsid'):
 		try:
 			os.setsid()