tests/histedit-helpers.sh

hghave: use subprocess instead of os.popen

os.popen was deprecated in Python 2.6 in favor of subprocess, so let's
move into the future.

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"
}