added http api for deleting auth roles

[invisig0th]

No description provided.

[codecov]

Codecov Report

Merging #1205 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1205      +/-   ##
==========================================
+ Coverage   93.48%   93.51%   +0.02%     
==========================================
  Files         124      124              
  Lines       16520    16561      +41     
==========================================
+ Hits        15444    15487      +43     
+ Misses       1076     1074       -2

Impacted Files	Coverage Δ
synapse/lib/httpapi.py	92.4% <100%> (+1.12%)	⬆️
synapse/tests/utils.py	92.09% <100%> (+0.1%)	⬆️
synapse/lib/cell.py	92.35% <100%> (+0.02%)	⬆️
synapse/lib/hive.py	96.61% <100%> (+0.02%)	⬆️

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