Str concatenation bug in storageService.py

[Vivian]

Hi,

While attempting to delete a file from the Storage Service, I came across a string concatenation error.

I am requesting a fix to this line in the storageService.py:

https://github.com/artefactual/archivematica/blob/qa/1.x/src/archivematica/archivematicaCommon/storageService.py#L540

old:

url = _storage_service_url() + "file/" + uuid + "/delete_aip/"

new:

url = _storage_service_url() + "file/" + str(uuid) + "/delete_aip/"

Apologies for not being able to submit a simple PR request -- I am having trouble with logging into my GitHub account with 2FA.

Thanks,

Vivian