[FAB-12594] reduce overhead of race in unit tests

Change-Id: I6c5f311d5da21923a36b939cfdef850be65c7bbf
Signed-off-by: Matthew Sykes <sykesmat@us.ibm.com>

Author: sykesm

unit-test/run.sh

@@ -75,6 +75,7 @@ run_tests() {
 
     local race_flags=""
     if [[ "$(uname -m)" == "x86_64" ]]; then
+        export GORACE=atexit_sleep_ms=0 # reduce overhead of race
         race_flags="-race"
     fi