Clarify and cleanup Config variables and functions.
* Clarify gerrit.config and project.config parameters.
* "alwaysShowButton" is obsolete, assumed true now.
* Include all parameters to REST API returned JSON object;
fix expected test output in ApiIT.java.
* Explain all parameters in rest-api.md.
* Minimize repeated calls to create PluginConfig:
* Change Action, Cache, Checker, OwnersDb, FindOwners to reuse
Config instead of creating it from PluginConfigFactory.
* Save one gerritConfig in Config and Cache projectConfig in Config.
* Add/simplify unit test interface functions.
* Coding style improvements:
* Use Duration.ofSeconds instead of TimeUnit.SECONDS.
Change-Id: If27b7ae0e0f59f434ec2d536e1b08af0857708e0
11 files changed
