tests/histedit-helpers.sh

run-tests: rename test description dict to testdesc

Previously the word "test" was used for both a Test instance and a path or
test dict. This patch renames them so it's clear that "testdesc" is the
dict, and "test" is the instance.

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
}