Reduce number of test events to 150 to get acceptable processing time

...TriggerTest/test/test_trig_data_v1Dev_slice_bjet_build.py

...gerTest/test/test_trig_data_v1Dev_slice_bphysics_build.py

...iggerTest/test/test_trig_data_v1Dev_slice_egamma_build.py

.../TriggerTest/test/test_trig_data_v1Dev_slice_jet_build.py

.../TriggerTest/test/test_trig_data_v1Dev_slice_met_build.py

...TriggerTest/test/test_trig_data_v1Dev_slice_muon_build.py

.../TriggerTest/test/test_trig_data_v1Dev_slice_tau_build.py