[sinttest] Check for PEP prerequisite

[guusdk]

Geolocation, Mood and UserTune functionality depends on the availability of PEP. If the server doesn't support PEP functinality, these tests should throw a TestNotPossible exception.

[Neustradamus]

@guusdk: Thanks for your work on the PEP test :)
It is on the road to fix PEP (OMEMO included too).

[Flowdalic]

This approach duplicates code. How about adding

void ensurePepSupported(XMPPConnection connection) throws …

to AbstractSmackIntegrationTest and calling this method in the constructor of the related tests.

[guusdk]

I see your point, but I am not convinced this change adds much value. The number of tests affected is small, and the duplication avoided is minimal. We would just be wrapping the same PepManager.getInstanceFor(conOne).isSupported() call.

Adding isSupported() to GeoLocationManager, MoodManager, and UserTuneManager would be more consistent with MamManager and OmemoManager, but that feels like overkill for such an old and rarely used mechanism.

I would lean toward keeping it simple.