* lwan: Run bash in verbose mode
Printing the whole command line helps debug the fuzzer build process.
* lwan: Zip fuzzing corpus for new fuzzers without changing build.sh
Instead of hardcoding the archiving of corpus-request-* files in the
Lwan repo into request_fuzzer_seed_corpus.zip, use the fuzzer driver
filename to derive the ZIP file name and corpus file names as each
fuzzer is being built.