tests/histedit-helpers.sh

branchmap: simplify update code

We drop iterrevs which are not needed anymore. The know head are never a
descendant of the updated set. It was possible with the old strip code. This
simplification make the code easier to read an update.

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"
}