tests: Deprecate the use of CLI commands in tests.

Since the stated policy regarding CLI commands is:
  "Note that the debug CLI is a developer's tool
   - no warranty express or implied - and that
   we may choose not to fix debug CLI bugs.",

this change emits a deprecation warning whenever a test case calls a CLI command.

Change-Id: I91b30e86ae1b2fca36732837f36cdda762cdf458
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>
diff --git a/test/Makefile b/test/Makefile
index f78c8a8..e5e63d7 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -111,7 +111,7 @@
 	@touch $@
 
 define retest-func
-@env FORCE_FOREGROUND=$(FORCE_FOREGROUND) FAILED_DIR=$(FAILED_DIR) VENV_PATH=$(VENV_PATH) scripts/setsid_wrapper.sh $(FORCE_FOREGROUND) $(VENV_PATH)/bin/activate $(PYTHON_INTERP) $(PYTHON_PROFILE_OPTS) run_tests.py -d $(TEST_DIR) $(UNITTEST_EXTRA_OPTS) || env FAILED_DIR=$(FAILED_DIR) COMPRESS_FAILED_TEST_LOGS=$(COMPRESS_FAILED_TEST_LOGS) scripts/compress_failed.sh
+@env FORCE_FOREGROUND=$(FORCE_FOREGROUND) FAILED_DIR=$(FAILED_DIR) VENV_PATH=$(VENV_PATH) scripts/setsid_wrapper.sh $(FORCE_FOREGROUND) $(VENV_PATH)/bin/activate $(PYTHON_INTERP) -Wd $(PYTHON_PROFILE_OPTS) run_tests.py -d $(TEST_DIR) $(UNITTEST_EXTRA_OPTS) || env FAILED_DIR=$(FAILED_DIR) COMPRESS_FAILED_TEST_LOGS=$(COMPRESS_FAILED_TEST_LOGS) scripts/compress_failed.sh
 endef
 
 .PHONY: sanity