TINKERPOP-2804 Moved gherkin files to gremlin-test resources

[spmallette]

https://issues.apache.org/jira/browse/TINKERPOP-2804

Taking this approach makes it easier for providers to reference the files from the classpath, otherwise they likely need to have copies of them on the local file system which isn't so good. This is a breaking change but it only affects providers. They will have a minor adjustment to make to their test infrastructure on upgrade.

VOTE +1

[vkagamlyk]

.net local test run without docker: System.IO.DirectoryNotFoundException : Could not find a part of the path 'C:\_Projects\tinkerpop-apache\gremlin-test\features'.
because https://github.com/apache/tinkerpop/blob/3.6-dev/gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gherkin/GherkinTestRunner.cs#L385

[codecov-commenter]

Codecov Report

Merging #1878 (f394d8f) into 3.6-dev (053064b) will decrease coverage by 5.39%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             3.6-dev    #1878      +/-   ##
=============================================
- Coverage      69.46%   64.06%   -5.40%     
=============================================
  Files            875       23     -852     
  Lines          41772     3679   -38093     
  Branches        5627        0    -5627     
=============================================
- Hits           29016     2357   -26659     
+ Misses         10770     1154    -9616     
+ Partials        1986      168    -1818     

Impacted Files	Coverage Δ
...pop/gremlin/driver/message/ResponseStatusCode.java
...emlin/structure/util/DefaultCloseableIterator.java
...apache/tinkerpop/gremlin/server/handler/Frame.java
...emlin/groovy/jsr223/GremlinGroovyScriptEngine.java
...p/gremlin/process/traversal/step/map/MathStep.java
...e/tinkerpop/gremlin/process/traversal/GraphOp.java
...a/org/apache/tinkerpop/gremlin/driver/Cluster.java
...pop/gremlin/process/computer/MemoryComputeKey.java
...nkerpop/gremlin/util/function/BulkSetSupplier.java
...ategy/optimization/IncidentToAdjacentStrategy.java
... and 842 more

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[vkagamlyk]

VOTE +1