[SYNPY-620] allow list of user/team ids to be specified in setPermission

[thomasyu888]

There needs to be more thought into how the code is configured here. The nested for loops are not ideal.

Release 2.8

[pep8speaks]

Hello @thomasyu888! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file synapseclient/client.py:

Line 1805:121: E501 line too long (122 > 120 characters)

[thomasyu888]

Closing until ready to be worked on