fix: don't create logging handler multiple times (DEV-2891)

[jnussbaum]

No description provided.

[linear]

DEV-2881 cleanup stashing algorithm

After implementation in production code (DEV-2), there are some things that should be cleaned up:

• add logging / printing to new code

• ~generate_upload_order()~~ should only have 2 return values~

  • ~stash_counter~~ can be calculated by the caller, with ~~sum(\[len(x) for x in stash_lookup.values()\])~
  • ~upload_order~~ doesn't make sense: once everything is stashed, there is no preferred order any more!~

• ~generate_upload_order()~~ should be renamed to ~~generate_stash()~

[linear]

DEV-2891 logging handler is created multiple times

Probably, this shouldn't happen. it would be better to create in on module level, so that it's created only once.

[BalduinLandolt]

Two minor comments, otherwise looking good. Did you notice any difference with only one handler created?