ci: Run CI_WAIT only on travis

.travis.yml

@@ -46,6 +46,7 @@ stages:
 env:
   global:
     - CI_RETRY_EXE="travis_retry"
+    - CI_WAIT="while sleep 500; do echo .; done"
     - CACHE_ERR_MSG="Error! Initial build successful, but not enough time remains to run later build stages and tests. Please manually re-run this job by using the travis restart button or asking a bitcoin maintainer to restart. The next run should not time out because the build cache has been saved."
 before_install:
   - set -o errexit; source ./ci/test/00_setup_env.sh

ci/test/06_script_b.sh

@@ -32,7 +32,7 @@ fi
 
 if [ "$RUN_UNIT_TESTS" = "true" ]; then
   BEGIN_FOLD unit-tests
-  bash -c "while sleep 500; do echo .; done" &  # Print dots in case the unit tests take a long time to run
+  bash -c "${CI_WAIT}" &  # Print dots in case the unit tests take a long time to run
   DOCKER_EXEC LD_LIBRARY_PATH=$BASE_BUILD_DIR/depends/$HOST/lib make $MAKEJOBS check VERBOSE=1
   END_FOLD
 fi