md_util: copy ops before sending them to revertRenames
md_util: copy ops before sending them to revertRenames

Since revertRenames could modify the ops concurrently with something
else handling the same rmd object.

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client