fix tryParentREST to report success

[remicollet]

Followup of #154

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[CloCkWeRX]

Could we (maybe in a separate PR if they are incidental) update the test expectations, ie:

001+ $pearweb->addRESTConfig("https://pecl.php.net/rest/r/test/allreleases.xml", false, false);
002+ No REST config for URL https://pecl.php.net/rest/r/test/allreleases.xml
========DONE========

(Or rebase if this was taken care of recently)

Edit: majority of test failures are not the above, turns out I clicked on the one lucky test result

[remicollet]

I understand now, the message displayed (addRESTConfig) is what should be used in the test,
so tests need to be updated