Envoy: disable AFL engine

[adisuissa]

Using AFL leads to out-of-space on the device.
Possible solution suggested in: bazel-contrib/rules_fuzzing#185

This PR disables AFL until we get this sorted out.

Signed-off-by: Adi Suissa-Peleg adip@google.com

[jonathanmetzman]

Is it only failing in CI?
I think we should simply blocklist the AFL build in CI or just ignore the failures. Deleting the build seems like the wrong solution IMO

[adisuissa]

Is it only failing in CI? I think we should simply blocklist the AFL build in CI or just ignore the failures. Deleting the build seems like the wrong solution IMO

Thanks @jonathanmetzman for the input!

The failure is in the oss-fuzz build (non-CI).
One of the errors we've received is:

Step #3 - "compile-afl-address-x86_64": Execution platform: @local_config_platform//:host
Step #3 - "compile-afl-address-x86_64": tar: bazel-out/k8-fastbuild/bin/test/common/http/http2/response_header_fuzz_test_oss_fuzz.tar: Wrote only 4096 of 10240 bytes
Step #3 - "compile-afl-address-x86_64": tar: Error is not recoverable: exiting now
Step #3 - "compile-afl-address-x86_64": �[32mINFO: �[0mElapsed time: 5284.051s, Critical Path: 1350.00s

Other failures are less informative, and do not happen at the same place in the build process.
The build itself works on a local machine with enough disk space.
If there was a way to temporarily increase the docker disk space, we can easily validate that this is indeed the issue.

One of the alternatives is bazel-contrib/rules_fuzzing#185, but this:

1. Does not guarantee to lower disk space usage below the current threshold.
2. Will also require updating the rules_fuzzing, and possibly other updates.

[adisuissa]

Some findings:
We've seen that the binary sizes when compiling with the AFL fuzzer are much larger.
For example:
AFL: -r-xr-xr-x 1 root root 1093254152 Dec 8 18:42 utility_fuzz_test
LIBFUZZER: -r-xr-xr-x 1 root root 115623224 Dec 9 15:42 utility_fuzz_test

The binary size with AFL is an order of magnitude larger.

[asraa]

I think this is fine at least until there's an interim solution to why AFL binaries are so large

[asraa]

Going to merge in the interim until AFL is fixed.