Revert "Use a longer test for travis"

This reverts commit a3d079e786f89d9661ba75a43066ea94cff71b4b.

Timeout.
Tweak targeting enemies
Don't retarget for non-leaders that can't walk
Add skirmish and PvP tests
Don't get stuck targeting a dead monster for too long

and target stairs under the actor, if other levels still unexplored.
Permit mutliple level switching

now that alternating between levels is unlikely, because actors
prefer unexplored levels. The remaining problem is repeated
pushing and being pushed through stairs in AI vs AI. This requires
another solution, but the cycle is eventually broken by spawners.