D5812: py3: pass str into ValueError to prevent b'' prefix in output

[pulkit (Pulkit Goyal)]

pulkit added a comment.


  I am not whether this is correct. This should have fix failure of `test-lfs-serve.t#lfsremote-on` failure on py3 but it does not.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D5812

To: pulkit, durin42, martinvonz, #hg-reviewers
Cc: mercurial-devel