Disable net_ftp_directory_listing_fuzzer on clusterfuzz.

The test hits a 25-second timeout for certain inputs, which has not yet been investigated.

Bug: 921297
Change-Id: I49a535c0c922ac4ffff44264102271b3c3977577
Reviewed-on: https://chromium-review.googlesource.com/c/1413060
Commit-Queue: Eric Roman <[email protected]>
Reviewed-by: Matt Menke <[email protected]>
Cr-Commit-Position: refs/heads/master@{#622938}
1 file changed