Fix NFAPI integration

This commit fixes issues introduced by the previous commit.

Summary of work:
- cleanup:
  - fix LOG_XX to be less verbose
  - fix cmake_targets/CMakeLists.txt
  - fix oaienv
  - remove dead code
- bug fixes:
  - in openair1/SCHED/fapi_l1.c we had:
      eNB->pdcch_vars[subframe&1].num_dci           = number_dci;
    should be:
      eNB->pdcch_vars[subframe&1].num_dci           = 0;
    This bug let the PHY send more DCIs than what should have been
    sent because num_dci is incremented later on in the code.
    This fix may be a problem for fapi mode, to be checked.
  - add new T VCD traces
  - revert openair1/PHY/TOOLS/file_output.c to 'develop' version
  - remove thread_id in logRecord/logRecord_mt
  - revert (and adapt) configuration files
  - be careful when doing frame++, we need to % 1024
  - revert target_rx_power in openair2/LAYER2/MAC/eNB_scheduler_ulsch.c
- NFAPI:
  - the open-nFAPI code has been included in the repository. See nfapi/README.
    Maybe we should "git clone" the Cisco repository instead. We have to be
    careful of availability though.

What has been tested:
- monolithic eNB FDD 5/10MHz with one UE, iperf UDP/TCP uplink/downlink

Anything else may fail to work, especially the FAPI mode, which has not
been tested at all.

openair1/SCHED/fapi_l1.h

@@ -48,7 +48,7 @@ void handle_nfapi_hi_dci0_dci_pdu(PHY_VARS_eNB *eNB,int frame,int subframe,eNB_r
 				  nfapi_hi_dci0_request_pdu_t *hi_dci0_config_pdu);
 void handle_nfapi_hi_dci0_hi_pdu(PHY_VARS_eNB *eNB,int frame,int subframe,eNB_rxtx_proc_t *proc,
 				 nfapi_hi_dci0_request_pdu_t *hi_dci0_config_pdu);
-void handle_nfapi_dlsch_pdu(PHY_VARS_eNB *eNB,int frame,int subframe,eNB_rxtx_proc_t *proc,  
+void handle_nfapi_dlsch_pdu(PHY_VARS_eNB *eNB,int frame,int subframe,eNB_rxtx_proc_t *proc,
 			    nfapi_dl_config_request_pdu_t *dl_config_pdu,
 			    uint8_t codeword_index,
 			    uint8_t *sdu);