[feat] Allow Sarus backend to load local images

[rsarm]

Fixes UES-676

[vkarak]

@rsarm Does it simply address UES-676 or does it fix it? If it only addresses it, why does it not fix it?

[vkarak]

@rsarm Can you please also update the PR title accordingly?

[pep8speaks]

Hello @rsarm, Thank you for updating!

Cheers! There are no PEP8 issues in this Pull Request!Do see the ReFrame Coding Style Guide

Comment last updated at 2020-02-20 23:21:15 UTC

[codecov-io]

Codecov Report

Merging #1170 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1170   +/-   ##
=======================================
  Coverage   92.03%   92.03%           
=======================================
  Files          81       81           
  Lines       11755    11755           
=======================================
  Hits        10819    10819           
  Misses        936      936

Impacted Files	Coverage Δ
unittests/test_shell.py	100% <ø> (ø)	⬆️
unittests/test_buildsystems.py	99.16% <ø> (ø)	⬆️
reframe/core/runtime.py	89.69% <ø> (ø)	⬆️
unittests/resources/checks/frontend_checks.py	99.21% <ø> (ø)	⬆️
reframe/core/launchers/registry.py	85% <ø> (ø)	⬆️
unittests/resources/checks/bad/noentry.py	80% <ø> (ø)	⬆️
reframe/core/fields.py	98.94% <ø> (ø)	⬆️
reframe/frontend/dependency.py	96.77% <ø> (ø)	⬆️
unittests/resources/settings.py	100% <ø> (ø)	⬆️
reframe/core/meta.py	100% <ø> (ø)	⬆️
... and 152 more

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[vkarak]

lgtm. Thanks @rsarm!