Add muon ART test running on MC

Trigger/TrigValidation/TrigUpgradeTest/test/test_trigUpgr_slice_mu_mc_build.sh

+#!/bin/bash
+# art-description: athenaMT trigger test on MC running L1 simulation and the muon menu
+# art-type: build
+# art-include: master/Athena
+# art-output: *.log
+# art-output: *.new
+# art-output: *.txt
+# art-output: *.root
+
+export EVENTS=10
+export THREADS=1
+export SLOTS=1
+export INPUT="run2mc_ttbar"
+export JOBOPTION="TrigUpgradeTest/full_menu.py"
+export EXTRA="doL1Sim=True;doEmptyMenu=True;doMuonSlice=True"
+
+# This test doesn't produce any output useful for RegTest, so do a dummy reference comparison
+export REGTESTEXP="leaving with code"
+export REGTESTREF=`find_data.py TrigUpgradeTest/dummy_regtest.ref`
+
+
+
+source exec_TrigUpgradeTest_art_athenaMT.sh
+source exec_TrigUpgradeTest_art_post.sh