don't kill a session when the user ctrl-C's during a command run by sessions -c or a script/postmod

git-svn-id: file:///home/svn/framework3/trunk@12513 4d416f70-5f16-0410-b530-b9f4589650da

lib/msf/base/sessions/command_shell.rb

@@ -146,6 +146,8 @@ class CommandShell
 				end
 			end
 		rescue ::Timeout::Error
+		rescue ::Interrupt => e
+			raise e
 		rescue ::Exception => e
 			shell_close
 			raise e