Set DANDI_ALLOW_LOCALHOST_URLS when running dandi-cli tests

[jwodder]

No description provided.

[codecov]

Codecov Report

Merging #66 (4c285de) into master (fc37096) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #66   +/-   ##
=======================================
  Coverage   96.07%   96.07%           
=======================================
  Files          13       13           
  Lines        1274     1274           
=======================================
  Hits         1224     1224           
  Misses         50       50           

Flag	Coverage Δ
unittests	96.07% <ø> (ø)

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[yarikoptic]

Let's proceed with this, thank you @jwodder. For longer term solution, filed #67