compaction: fix two small bugs

1. Compaction thread was not ending up in the right cpuset after
the move to phenotype because the thread would not be started when
AMS tried to set it. Add a new cpuset change, but leave the existing
one once we add a default-on property.

2. Don't compact processes with oom_adj 1001.

Test: boots, works, CompactionThread in the right cpuset
bug 119988524

Change-Id: I02625d7925e572c15e74ae172f438e9e1130d499