All changes in this patch were performed automatically with `shfmt` with
configuration flags specified in `.pre-commit-config.yaml`.
In addition to fixing whitespace the roundtrip through shfmt's AST also
transforms command substitutions
`cmd`
# becomes
$(cmd)
and some redirects
>&2 echo "msg"
# becomes
echo >&2 "msg"
GCC has a "feature" where it doesn't realize that files in the
src/zeek/... tree are the same as files in the normal 'src/' tree. This
leads the coverage script to send duplicates to Coveralls and pollute
the display with them. The new script scrapes the intermediate output
from lcov and de-duplicates anything in src/zeek/ to be just from src/.
Add types of files that genhtml (the program that generates html files
from .gcno/.gcda files, included in lcov) should ignore, such as .yy and
.ll files.
