Bugfix. FP of LOCAL_VARIABLE_EARLY_DECLARATION with other variables and a loop

[aktsay6]

What's done:

• Fixed bugs
• Added tests

This pull request closes #581

[codecov]

Codecov Report

Merging #635 (4cabf6d) into master (4edbd78) will decrease coverage by 0.00%.
The diff coverage is 85.71%.

@@             Coverage Diff              @@
##             master     #635      +/-   ##
============================================
- Coverage     80.83%   80.83%   -0.01%     
- Complexity     1774     1775       +1     
============================================
  Files            90       90              
  Lines          4670     4680      +10     
  Branches       1408     1410       +2     
============================================
+ Hits           3775     3783       +8     
- Misses          317      318       +1     
- Partials        578      579       +1     

Flag	Coverage Δ	Complexity Δ
unittests	80.83% <85.71%> (-0.01%)	0.00 <2.00> (ø)

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

Impacted Files	Coverage Δ	Complexity Δ
...at/ruleset/rules/ExtensionFunctionsSameNameRule.kt	88.88% <ø> (ø)	18.00 <0.00> (ø)
...kotlin/org/cqfn/diktat/ruleset/rules/LineLength.kt	84.05% <ø> (ø)	74.00 <0.00> (ø)
...lin/org/cqfn/diktat/ruleset/rules/SmartCastRule.kt	64.16% <ø> (ø)	36.00 <0.00> (ø)
...tlin/org/cqfn/diktat/ruleset/utils/AstNodeUtils.kt	84.82% <ø> (ø)	0.00 <0.00> (ø)
...at/ruleset/rules/identifiers/LocalVariablesRule.kt	90.78% <84.61%> (-1.64%)	25.00 <2.00> (+1.00)	⬇️
...n/kotlin/org/cqfn/diktat/ruleset/rules/SortRule.kt	86.76% <100.00%> (ø)	23.00 <0.00> (ø)

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[petertrr]

We also have several suppressed LOCAL_VARIABLE_EARLY_DECLARATION in our code, please find the ones that will be fixed by your change and un-suppress them

[petertrr]

LGTM