Work around a posix violation in the croups filesystem that LTP requires.

Posix says you removing a non-empty directory "shall fail" in both:
https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/functions/unlinkat.html
https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/functions/rmdir.html

So toybox mv went ahead and unlinked the directory even if the contents
hadn't all been deleted because posix guarantees it to be harmless. But
cgroups (https://lwn.net/Articles/679786/) deletes the non-empty directory,
thus the Linux Test Project's cgroups_fj_function test6 was failing with
toybox mv because they depend on not triggering the posix violating behavior.

Work around it by having mv DIRTREE_SAVE failing nodes and then check for
a non-empty ->child in the COMEAGAIN as a signal not to unlink the dir.

While I'm there do some code cleanup, add a cp -i test...

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