Added support for the UL split:

TODO:
1) connection to UEs is broken (tested for oaisim)
2) Memory management problems, oaisim is exiting for large rates of traffic

targets/COMMON/MESSAGES/V2/flexsplit.proto

@@ -12,6 +12,7 @@ message flexsplit_message {
               fspRlcDataReq data_req_msg = 4;
 	      fspRlcDataReqAck data_req_ack = 5;
 	      fspPdcpDataInd data_ind_msg = 6;
+	      fspPdcpDataIndAck data_ind_ack = 7;
 	}
 }
 
@@ -77,3 +78,8 @@ message fspPdcpDataInd {
 	optional uint32 eNB_id = 2;
         optional fspRlcData rlc_data = 3;
 }
+
+message fspPdcpDataIndAck {
+        optional fsp_header header = 1;
+	optional uint32 result = 2;
+}

targets/COMMON/MESSAGES/V2/header.proto

@@ -14,5 +14,6 @@ enum fsp_type {
      FSPT_RLC_DATA_REQ = 3;
      FSPT_RLC_DATA_REQ_ACK = 4;
      FSPT_PDCP_DATA_IND = 5;
+     FSPT_PDCP_DATA_IND_ACK = 6;
 }