Updated non-blocking PDCP socket

More accurately, we changed the do/while infinite
loop to be an infinite for loop for the read command of
the socket. The socket file descriptor choice is more clear now.

nfapi/open-nFAPI/pnf/src/pnf_interface.c

@@ -19,6 +19,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include "nfapi/open-nFAPI/pnf/inc/pnf_p7.h"
 
 nfapi_pnf_config_t* nfapi_pnf_config_create()
 {