Wildcard to run all service tests [*] (#2739)

Close #2685.

doc/service-tests.md

@@ -290,6 +290,11 @@ For example:
 - [Travis Sonar] Support user token authentication
 - Add tests for [CRAN] and [CPAN]
 
+In the rare case when it's necessary to see the output of a full service-test
+run in a PR, include `[*]` in the title. Unless all the tests pass, the build
+will fail, so likely it will be necessary to remove it and re-run the tests
+before merging.
+
 ## Getting help
 
 If you have questions about how to write your tests, please open an issue. If

lib/service-test-runner/cli.js

@@ -102,7 +102,7 @@ if (stdinOption && onlyOption) {
   onlyServices = onlyOption.split(',')
 }
 
-if (typeof onlyServices === 'undefined') {
+if (typeof onlyServices === 'undefined' || onlyServices.includes('*')) {
   console.info('Running all service tests.')
 } else if (onlyServices.length === 0) {
   console.info('No service tests to run. Exiting.')