tests/histedit-helpers.sh

testrunner: make `-j100 --runs-per-test=100 test-foo.t` use 100 jobs

It would use only 1 job since 1039404c5e1d (run-tests: print number of
tests and parallel process count, 2018-10-13), but I'm pretty sure
that was unintentional.

Differential Revision: https://phab.mercurial-scm.org/D5557

fixbundle() {
    grep -v 'saving bundle' | grep -v 'saved backup' | \
        grep -v added | grep -v adding | \
        grep -v "unable to find 'e' for patching" | \
        grep -v "e: No such file or directory" | \
    cat
}