Slurm multi version

[jspaaks]

The code in this pull request is meant to be tested against images from this pull request xenon-middleware/xenon-docker-images#16

[sverhoeven]

Java code looks OK.

CI builds fail due to images not being found.

After xenon-middleware/xenon-docker-images#16 is merged and Automated Build has been setup then this PR can be retested and merged.

[codecov-io]

Codecov Report

Merging #492 into master will decrease coverage by <.01%.
The diff coverage is 71.42%.

@@             Coverage Diff              @@
##             master     #492      +/-   ##
============================================
- Coverage     78.83%   78.82%   -0.01%     
- Complexity     1326     1327       +1     
============================================
  Files           101      101              
  Lines          4360     4364       +4     
  Branches        639      640       +1     
============================================
+ Hits           3437     3440       +3     
- Misses          735      736       +1     
  Partials        188      188

Flag	Coverage Δ	Complexity Δ
#fixedclientenvironment	21.65% <0%> (-0.02%)	349 <0> (ø)
#integration	50.84% <71.42%> (-0.24%)	748 <8> (-4)
#livelocal	7.76% <0%> (-0.01%)	129 <0> (ø)
#unit	52.86% <0%> (+0.06%)	961 <0> (+3)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
...enon/adaptors/schedulers/slurm/SlurmScheduler.java	68.96% <71.42%> (-0.54%)	32 <8> (ø)
...nl/esciencecenter/xenon/utils/StreamForwarder.java	76.92% <0%> (+1.92%)	12% <0%> (+1%)	⬆️

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