This MR request adds new low-µ MinBias exclusive trigger items:
HLT_mb_excl_1trk2_pt1_vetombts2in_L1TRT_FILLED
HLT_mb_excl_1trk2_pt1_vetombts2in_L1TRT_EMPTY
HLT_mb_excl_1trk2_pt1_L1TRT_FILLED
HLT_mb_excl_1trk2_pt1_L1TRT_EMPTY
CC: @tbold @mdyndal