Return unsupported error on GetBucketPolicyStatus

[smallhive]

Closes #865.

[codecov]

Codecov Report

Merging #886 (81e3b9d) into master (d703219) will decrease coverage by 0.01%.
Report is 10 commits behind head on master.
The diff coverage is 27.27%.

@@            Coverage Diff             @@
##           master     #886      +/-   ##
==========================================
- Coverage   34.44%   34.43%   -0.01%     
==========================================
  Files          62       62              
  Lines       10579    10581       +2     
==========================================
  Hits         3644     3644              
- Misses       6528     6530       +2     
  Partials      407      407              

Files	Coverage Δ
api/handler/acl.go	69.82% <0.00%> (ø)
api/handler/util.go	47.05% <50.00%> (ø)
api/handler/not_support.go	0.00% <0.00%> (ø)

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