Add validation of required path parameters

[vadeg]

Add path parameter validation

Determines whether this parameter is mandatory. If the parameter location is "path", this property is REQUIRED and its value MUST be true. Otherwise, the property MAY be included and its default value is false.

Fixes #459

[codecov-commenter]

Codecov Report

Merging #1252 (e575f34) into master (34594a2) will decrease coverage by 0.01%.
The diff coverage is 71.42%.

@@             Coverage Diff              @@
##             master    #1252      +/-   ##
============================================
- Coverage     76.10%   76.09%   -0.02%     
- Complexity      966      973       +7     
============================================
  Files           186      187       +1     
  Lines          2871     2878       +7     
  Branches        501      502       +1     
============================================
+ Hits           2185     2190       +5     
- Misses          426      427       +1     
- Partials        260      261       +1     

Impacted Files	Coverage Δ
.../kotlin/org/zalando/zally/core/util/OpenApiUtil.kt	51.19% <0.00%> (-0.62%)	⬇️
...g/zalando/zally/ruleset/zally/PathParameterRule.kt	83.33% <83.33%> (ø)

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[vadeg]

👍

[tkrop]

Looks good, but I would let us cover all use cases with tests.

[vadeg]

Waits #1258 to be merged.

[tkrop]

👍

[vadeg]

👍