[JAXRS-spec] Added support for cookie parameters

[alfabetacain]

Added support for cookie parameters to the jaxrs-spec generator, which should fix #2908.
Added the test case testGenerateApiWithCookieParameter_issue2908 to JavaJAXRSSpecServerCodegenTest.java, which uses the file issue_2908.yaml for testing that cookie parameter generation works.
Briefly, the fix was adding a new mustache template (cookieParams.mustache) to the jaxrs-spec generator and referencing it in api.mustache in the same way the other parameter types are referenced (e.g. queryParams.mustache).
The new cookieParams.mustache is essentially a copy of the queryParams.mustache.

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cc @bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04) @lwlee2608 (2019/10) @bkabrda (2020/01)

[wing328]

Thanks for the PR but your commit (as shown in the Commits tab) is not linked to your Github account, which means this PR won't count as your contribution in https://github.com/OpenAPITools/openapi-generator/graphs/contributors.

Let me know if you need help fixing it.

Ref: https://github.com/OpenAPITools/openapi-generator/wiki/FAQ#how-can-i-update-commits-that-are-not-linked-to-my-github-account

[alfabetacain]

Wrong email used. Thanks a lot :-)
I've pushed an amended commit (just changed the author)

[wing328]

LGTM