pySim-trace_test.sh: Force termcolor to suppress color generation

on some systems, the output would otherwise contain colored status
words, which in turn mean the test otuput no longer matches the expected
output.

Change-Id: Icb700f6e85a285748e00367a398975aa5e75dec5
---
M tests/pySim-trace_test.sh
1 file changed, 15 insertions(+), 0 deletions(-)

diff --git a/tests/pySim-trace_test.sh b/tests/pySim-trace_test.sh
index f7b97e8..3e200c3 100755
--- a/tests/pySim-trace_test.sh
+++ b/tests/pySim-trace_test.sh
@@ -25,6 +25,8 @@
 TEMPFILE=temp.tmp
 
 export PYSIM_INTEGRATION_TEST=1
+# to avoid termcolor.colored generating colors; https://github.com/termcolor/termcolor
+export ANSI_COLORS_DISABLED=1
 
 echo "pySim-trace_test - a test program to test pySim-trace.py"
 echo "========================================================"

