going on with openCL ldpc implem

Enhance loader to allow library version selection for executables, as ldcptest which do not use the config module.

See merge request oai/openairinterface5g!1291

MR !1277 : fixes for nr_set_pdsch_semi_static
MR !1225 : Cleanup and first step to enhance cpu measurments
MR !1278 : NR cleanup separation macphy
MR !1289 : Nr dlsch retransmission fix pucch allocation
MR !1270 : Removing hardcoded value of min channel bw for type0 pdcch
MR !1283 : Bugfix simultaneous RACH with multiple UEs

cherry-picks :
* MAC statistics in separate thread
* CI conf files update

Merge remote-tracking branch 'origin/NR_min_channel_bw_for_type0_pdcch' into integration_2021_wk42_b

Merge remote-tracking branch 'origin/NR_DLSCH_retransmission_fix_pucch_allocation' into integration_2021_wk42_b