tests/histedit-helpers.sh

manifest: change changectx to access manifest via manifestlog

This is the first place where we'll start using manifestctx instances instead of
manifestdict. This will facilitate using different manifestctx implementations
in 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" | \
    cat
}