innodb.innodb_simulate_comp_failures_small is too slow if it's run on a real disk

We have a report from otto that innodb.innodb_simulate_comp_failures_small fails reliably in his installation due to the timeout; also, it fails on some buildbot platforms: bld-dan-debug, bld-dan-release, bintar-rhel7-p8-debug, bintar-rhel7-p8.

I tried to run it on a non-virtual machine without --mem, and got the same issue.

The problem is that individual INSERTs are performed too slowly. We need to modify either the test itself, or its options not to flush after every commit.