qa/1199: fetch _every_ metric first
qa/1199: fetch _every_ metric first

Force as many of the dynamic allocations in pmcd to happen as possible
before we go belting the context churn test looking for leaks.

Increase the batch for pminfo so this first step is a little faster.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp