Fix modules filter wrong results while using comma

[OleksandrOrlov]

Filter returned results only when one module was specified in the Module
filter field on Test Result Overview page. It returned no results while
using comma-separated module names.

The commit fixes the issue and allows to filter job groups by several
module names separated by comma (e.g. module1,module2).

[codecov]

Codecov Report

Merging #1993 into master will decrease coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1993      +/-   ##
==========================================
- Coverage   89.14%   88.99%   -0.16%     
==========================================
  Files         154      154              
  Lines       10438    10438              
==========================================
- Hits         9305     9289      -16     
- Misses       1133     1149      +16

Impacted Files	Coverage Δ
lib/OpenQA/Utils.pm	94.57% <100%> (-0.18%)	⬇️
lib/OpenQA/Scheduler/Scheduler.pm	88.47% <0%> (-2.31%)	⬇️
lib/OpenQA/Worker/Common.pm	82.04% <0%> (-2.12%)	⬇️
lib/OpenQA/WebSockets/Server.pm	90.41% <0%> (-1.83%)	⬇️

---

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[codecov]

Codecov Report

Merging #1993 into master will decrease coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1993      +/-   ##
==========================================
- Coverage   89.14%   88.99%   -0.16%     
==========================================
  Files         154      154              
  Lines       10438    10438              
==========================================
- Hits         9305     9289      -16     
- Misses       1133     1149      +16

Impacted Files	Coverage Δ
lib/OpenQA/Utils.pm	94.57% <100%> (-0.18%)	⬇️
lib/OpenQA/Scheduler/Scheduler.pm	88.47% <0%> (-2.31%)	⬇️
lib/OpenQA/Worker/Common.pm	82.04% <0%> (-2.12%)	⬇️
lib/OpenQA/WebSockets/Server.pm	90.41% <0%> (-1.83%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update aab5333...bcf7b17. Read the comment docs.

[okurz]

Seems like https://travis-ci.org/os-autoinst/openQA/jobs/490617158 failed because the docker image failed to be pulled. I retriggered the travis CI job https://travis-ci.org/os-autoinst/openQA/jobs/490617158 which passed now.