Avoided periodic allocations in api tests.
Avoided periodic allocations in api tests.

Turn off periodic allocations to avoid the race between
`HierarchicalAllocator::updateAvailable()` and periodic allocations.

Review: https://reviews.apache.org/r/63012

andschwa/mesos,jpeach/mesos,reneploetz/mesos,asamerh4/mesos,Gilbert88/mesos,jpeach/mesos,reneploetz/mesos,dforsyth/mesos,asamerh4/mesos,kaysoky/mesos,jpeach/mesos,gsantovena/mesos,dforsyth/mesos,gsantovena/mesos,kaysoky/mesos,Gilbert88/mesos,chhsia0/mesos,gsantovena/mesos,jpeach/mesos,abudnik/mesos,gsantovena/mesos,asamerh4/mesos,asamerh4/mesos,kaysoky/mesos,gsantovena/mesos,zmalik/mesos,jpeach/mesos,zmalik/mesos,jpeach/mesos,dforsyth/mesos,abudnik/mesos,reneploetz/mesos,Gilbert88/mesos,chhsia0/mesos,Gilbert88/mesos,chhsia0/mesos,kaysoky/mesos,asamerh4/mesos,dforsyth/mesos,chhsia0/mesos,abudnik/mesos,jpeach/mesos,asamerh4/mesos,reneploetz/mesos,kaysoky/mesos,andschwa/mesos,gsantovena/mesos,chhsia0/mesos,Gilbert88/mesos,kaysoky/mesos,Gilbert88/mesos,gsantovena/mesos,Gilbert88/mesos,abudnik/mesos,zmalik/mesos,andschwa/mesos,reneploetz/mesos,chhsia0/mesos,dforsyth/mesos,dforsyth/mesos,reneploetz/mesos,zmalik/mesos,abudnik/mesos,zmalik/mesos,asamerh4/mesos,abudnik/mesos,kaysoky/mesos,chhsia0/mesos,dforsyth/mesos,abudnik/mesos,zmalik/mesos,andschwa/mesos,andschwa/mesos,andschwa/mesos,zmalik/mesos,andschwa/mesos,reneploetz/mesos