Fix Travis CI Shell Options (#2490)

* Allow unset variables in travis_setup_env

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

* Don't exit immediately for Travis regressions

Disables immediate failure when running travis_wait methods. These
tests need to keep going even if they fail to do things like print out
the log.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

* Remove +verbose from JTAG regressions

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

regression/Makefile

@@ -277,7 +277,7 @@ ifdef SEED
 SEED_ARG = --seed $(SEED)
 endif
 
-JTAG_DTM_SIM_ARGS = +verbose +jtag_rbb_enable=1 $(SEED_ARG)
+JTAG_DTM_SIM_ARGS = +jtag_rbb_enable=1 $(SEED_ARG)
 
 stamps/%/vsim-jtag-dtm-32-$(JTAG_DTM_TEST).stamp: stamps/%/vsim$(JTAG_STAMP_SUFFIX).stamp stamps/riscv-tests.stamp
 	RISCV=$(RISCV) PATH="$(abspath $(RISCV)/bin:$(PATH))" $(GDBSERVER) \

regression/run-test-bucket

@@ -28,7 +28,9 @@ if [[ ${TRAVIS:-false} == true ]]; then
   . "${regression_dir}/travis_setup_env.bash"
   . "${regression_dir}/travis_jigger.bash"
   . "${regression_dir}/travis_wait.bash"
+  set +u
   travis_setup_env
+  set -u
 else
   # If not running on Travis CI, Stub out the travis_wait to be a no-op, since
   # it's unnecessary and it has some undesirable side effects such as hiding

regression/travis_wait.bash

@@ -23,6 +23,7 @@
 # https://github.com/travis-ci/travis-build/blob/73a5393263e0b135f49aceeb40ef6f0d827b9b11/lib/travis/build/bash/travis_wait.bash
 
 travis_wait() {
+  set +e
   local timeout="${1}"
 
   if [[ "${timeout}" =~ ^[0-9]+$ ]]; then
@@ -56,5 +57,6 @@ travis_wait() {
   echo -e "\\n${ANSI_GREEN}Log:${ANSI_RESET}\\n"
   cat "${log_file}"
 
+  set -e
   return "${result}"
 }