Removed file path from warning messages

[petertrr]

What's done:

• Changed code
• Changed tests

This pull request closes #619

[codecov]

Codecov Report

Merging #621 (6849dd0) into master (ac07d98) will increase coverage by 0.00%.
The diff coverage is 84.21%.

@@            Coverage Diff            @@
##             master     #621   +/-   ##
=========================================
  Coverage     80.75%   80.76%           
  Complexity     1748     1748           
=========================================
  Files            89       89           
  Lines          4615     4612    -3     
  Branches       1386     1391    +5     
=========================================
- Hits           3727     3725    -2     
+ Misses          322      320    -2     
- Partials        566      567    +1     

Flag	Coverage Δ	Complexity Δ
unittests	80.76% <84.21%> (+<0.01%)	0.00 <4.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...org/cqfn/diktat/ruleset/rules/kdoc/KdocComments.kt	79.68% <50.00%> (ø)	70.00 <0.00> (ø)
...fn/diktat/ruleset/rules/files/FileStructureRule.kt	81.57% <66.66%> (-1.03%)	55.00 <0.00> (ø)
...in/org/cqfn/diktat/ruleset/rules/files/FileSize.kt	77.27% <71.42%> (+10.60%)	8.00 <0.00> (-1.00)	⬆️
...diktat/ruleset/rules/comments/HeaderCommentRule.kt	84.88% <81.81%> (-1.71%)	38.00 <0.00> (+1.00)	⬇️
...org/cqfn/diktat/ruleset/rules/AvoidUtilityClass.kt	71.42% <100.00%> (ø)	15.00 <0.00> (ø)
...kotlin/org/cqfn/diktat/ruleset/rules/FileNaming.kt	90.47% <100.00%> (ø)	8.00 <3.00> (ø)
...lin/org/cqfn/diktat/ruleset/rules/PackageNaming.kt	94.04% <100.00%> (+0.07%)	32.00 <1.00> (ø)
...cqfn/diktat/ruleset/rules/files/IndentationRule.kt	86.40% <100.00%> (ø)	25.00 <0.00> (ø)
...g/cqfn/diktat/ruleset/rules/kdoc/KdocFormatting.kt	76.66% <100.00%> (-0.31%)	73.00 <0.00> (ø)
.../org/cqfn/diktat/ruleset/rules/kdoc/KdocMethods.kt	85.29% <100.00%> (ø)	70.00 <0.00> (ø)
... and 1 more

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