ankou fuzzer is disabled due to OOMs, need higher configuration vms

In https://www.fuzzbench.com/reports/2020-05-28/index.html I tested new the new preemptible strategy in an experiment comparing ankou to other fuzzers. However, ankou seems to fail a lot in ways that have nothing to do with the preemptible strategy. For example, in freetype2-2017, only 6 out of 20 trials of ankou that weren't terminated before 23 hours, actually produced corpus for 23 hours. When I took a look at the logs of one of the trials that lasted 23 hours (using this command `gsutil cat gs://fuzzbench-data/2020-05-28/experiment-folders/freetype2-2017-ankou/trial-147317/results/fuzzer-log.txt`) I see the following:
```
[run_fuzzer] Running target with Ankou
[run_fuzzer] Running command: ./Ankou -app /out/fuzz-target -i /out/seeds -o /out/corpus
2020/05/28 22:37:30 Invalid fuzz duration: time: invalid duration .
Persistent mode detected.
Deferred fork server detected.
len(inputs) = 2
len(seedPts) = 2
Traceback (most recent call last):
File "", line 1, in
File "/out/fuzzer.py", line 48, in fuzz
subprocess.check_call(command)
File "/usr/local/lib/python3.7/subprocess.py", line 363, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['./Ankou', '-app', '/out/fuzz-target', '-i', '/out/seeds', '-o', '/out/corpus']' died with .
```