revert WfsDelay short-circuit on exploit failure

Some exploits currently succeed, but can fail during cleanup, leading to a
false-negative. Reverting this so that the affected exploits can be fixed
first.

This reverts commits b0858e9 and
b3f7541.

Author: Brent Cook

lib/msf/base/simple/exploit.rb

@@ -237,9 +237,6 @@ def handle_exception e
 
     # Report the failure (and attempt) in the database
     self.report_failure
-
-    # Interrupt any session waiters in the handler
-    self.interrupt_handler
   end
   #
   # Calls the class method.

lib/msf/core/exploit.rb

@@ -1193,19 +1193,9 @@ def handler_enabled?
   # value can be one of the Handler::constants.
   #
   def handler(*args)
-    return unless payload_instance
-    return unless handler_enabled?
-    payload_instance.handler(*args)
-  end
-
-  #
-  # Break out of the session wait loop (WfsDelay)
-  #
-  def interrupt_handler
-    return unless payload_instance
-    return unless handler_enabled?
-    return unless payload_instance.respond_to?(:interrupt_wait_for_session)
-    payload_instance.interrupt_wait_for_session()
+    return if not payload_instance
+    return if not handler_enabled?
+    return payload_instance.handler(*args)
   end
 
   ##

lib/msf/core/handler.rb

@@ -162,14 +162,6 @@ def wait_for_session(t = wfs_delay)
     return session
   end
 
-  #
-  # Interrupts a wait_for_session call by notifying with a nil event
-  #
-  def interrupt_wait_for_session
-    return unless session_waiter_event
-    session_waiter_event.notify(nil)
-  end
-
   #
   # Set by the exploit module to configure handler
   #