fix permissions update from config using requests code path

[fmigneault]

Tested using magpie.register.magpie_register_permissions_from_config from a script with a set of Permission entries and a remote Magpie instance URL. Updates applied where things broke.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 80.88%. Comparing base (154736d) to head (5ee83c5).
Report is 1 commits behind head on master.

❗ Current head 5ee83c5 differs from pull request most recent head 5285b6e

Please upload reports for the commit 5285b6e to get more accurate results.

Files	Patch %	Lines
magpie/register.py	0.00%	11 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #610   +/-   ##
=======================================
  Coverage   80.88%   80.88%           
=======================================
  Files          73       73           
  Lines       10201    10191   -10     
  Branches     1825     1825           
=======================================
- Hits         8251     8243    -8     
+ Misses       1626     1625    -1     
+ Partials      324      323    -1     

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[fmigneault]

Added #612 which tests the requests code path while evaluating it.