Use DEPRECATION instead of WARNING for package deprecation messages

This makes it possible to treat the warnings differently in downstream packages.
Refer to the CMake documentation for more info: https://cmake.org/cmake/help/v3.0/command/message.html

Signed-off-by: Jose Luis Rivero <jrivero@osrfoundation.org>

ament_cmake_test/ament_cmake_test/__init__.py

@@ -103,7 +103,7 @@ def main(argv=sys.argv[1:]):
     # in case the command segfaults or timeouts and does not generate one
     failure_result_file = _generate_result(
         args.result_file,
-        failure_message='The test did not generate a result file.')
+        error_message='The test did not generate a result file.')
     with open(args.result_file, 'w') as h:
         h.write(failure_result_file)
 
@@ -237,7 +237,7 @@ def log(msg, **kwargs):
             # regenerate result file to include output / exception of the invoked command
             failure_result_file = _generate_result(
                 args.result_file,
-                failure_message='The test did not generate a result file:\n\n' + output)
+                error_message='The test did not generate a result file:\n\n' + output)
             with open(args.result_file, 'w') as h:
                 h.write(failure_result_file)
         else:
@@ -293,7 +293,7 @@ def log(msg, **kwargs):
     return rc
 
 
-def _generate_result(result_file, *, failure_message=None, skip=False):
+def _generate_result(result_file, *, failure_message=None, skip=False, error_message=None):
     # the generated result file must be readable
     # by any of the Jenkins test result report publishers
     pkgname = os.path.basename(os.path.dirname(result_file))
@@ -304,17 +304,18 @@ def _generate_result(result_file, *, failure_message=None, skip=False):
         '<skipped type="skip" message="">![CDATA[Test Skipped by developer]]</skipped>' \
         if skip else ''
     return """<?xml version="1.0" encoding="UTF-8"?>
-<testsuite name="%s" tests="1" failures="%d" time="0" errors="0" skipped="%d">
+<testsuite name="%s" tests="1" failures="%d" time="0" errors="%d" skipped="%d">
   <testcase classname="%s" name="%s.missing_result" time="0">
-    %s%s
+    %s%s%s
   </testcase>
 </testsuite>\n""" % \
         (
             pkgname,
             1 if failure_message else 0,
+            1 if error_message else 0,
             1 if skip else 0,
             pkgname, testname,
-            failure_message, skipped_message
+            failure_message, skipped_message, error_message
         )