Fix rendering mujoco to pixels in docker (bp #1835)

[mergify]

This is an automated backport of pull request #1835 done by Mergify

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[codecov]

Codecov Report

Merging #1838 into release-2020.06 will increase coverage by 0.00%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           release-2020.06    #1838   +/-   ##
================================================
  Coverage            90.69%   90.70%           
================================================
  Files                  213      213           
  Lines                11159    11159           
  Branches              1343     1343           
================================================
+ Hits                 10121    10122    +1     
  Misses                 783      783           
+ Partials               255      254    -1     

Impacted Files	Coverage Δ
src/garage/plotter/plotter.py	61.36% <0.00%> (-2.28%)	⬇️
src/garage/misc/tensor_utils.py	88.59% <0.00%> (+1.75%)	⬆️
...e/np/exploration_policies/epsilon_greedy_policy.py	100.00% <0.00%> (+3.57%)	⬆️

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