Do not print all XnAP logs

NSA is quite verbose, some messages are large and it is not very
"interesting" for the average user. The logs can be enabled on demand,
or directly seen in Wireshark instead.

openair2/X2AP/x2ap_eNB_encoder.c

@@ -44,9 +44,9 @@ int x2ap_eNB_encode_pdu(X2AP_X2AP_PDU_t *pdu, uint8_t **buffer, uint32_t *len)
   DevAssert(buffer != NULL);
   DevAssert(len != NULL);
 
-  //if (asn1_xer_print) {
+  if (asn1_xer_print) {
     xer_fprint(stdout, &asn_DEF_X2AP_X2AP_PDU, (void *)pdu);
-  //}
+  }
 
   encoded = aper_encode_to_new_buffer(&asn_DEF_X2AP_X2AP_PDU, 0, pdu, (void **)buffer);