Also fix a handful of segfaults caused by improperly retained byte slices
from bolt, and combine two view transactions into one to avoid data
race when a delete happened between them.
In TestScheduler_RunLog, the run log gets updated asynchronously so we
need to poll to ensure we don't read a stale value.
In TestScheduler_CreateNextRunOnTick, we were previously reading the
one entry out of two from a map, so it was often the entry we weren't
interested in.
Mark Rushakoff
Lyon Hill
Jade McGough