Adding Locust report files parser.

[grzesikluk]

This code is implementation of locustio reports parser.

It expects the reports generated in Locust *csv format as described in documentation.

[codecov]

Codecov Report

Merging #191 into master will increase coverage by 0.39%.
The diff coverage is 94.82%.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   71.61%   72.01%   +0.39%     
==========================================
  Files          45       46       +1     
  Lines        4245     4302      +57     
  Branches      761      766       +5     
==========================================
+ Hits         3040     3098      +58     
- Misses        908      909       +1     
+ Partials      297      295       -2

Impacted Files	Coverage Δ
...on/plugins/performance/parsers/ParserDetector.java	75.36% <83.33%> (+3.48%)	⬆️
...dson/plugins/performance/parsers/LocustParser.java	96.15% <96.15%> (ø)
.../hudson/plugins/performance/reports/UriReport.java	71.49% <0%> (ø)	⬆️
...on/plugins/performance/reports/AbstractReport.java	61.22% <0%> (+2.04%)	⬆️
...ns/performance/actions/PerformanceBuildAction.java	81.81% <0%> (+3.03%)	⬆️

---

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 ea776c1...6d3ee10. Read the comment docs.

[artem-fedorov]

sorry, missed notification from this repo