gerrit_plugin: Consistently pass kwargs to java rules
gerrit_plugin: Consistently pass kwargs to java rules

This allows us to pass additional parameters to gerrit_plugin:

  gerrit_plugin(
      name = "secure-config",
      javacopts = ["-Xep:InsecureCryptoUsage:OFF"],
      [...]

Change-Id: Ibcd328fc970fe65b33de789081a07bf0f1a0969f

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