GOLD-615: Configuring pylint, and fixing code bugs found by pylint. Unused variable bugs fixed in apps.logging.model, lru_cache, and goldstone.views. Created pylint configuration file.
GOLD-615: Configuring pylint, and fixing code bugs found by pylint. Unused variable bugs fixed in apps.logging.model, lru_cache, and goldstone.views. Created pylint configuration file.

Solinea/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,slashk/goldstone-server,slashk/goldstone-server