More robust package name handling

At https://builds.apache.org/view/S-Z/view/Sling/job/sling-trunk-1.6

SLING2522Test.testThatServicesWhichLikeAdapterFactoriesArentShowInTheW
Failing for the past 7 builds (Since Unstable#2862 )

Expected status 200 for http://localhost:47139/system/console/adapters
...
expected:<200> but was:<500>