Revert "kvs.cache_gc() uses provided logger"
Revert "kvs.cache_gc() uses provided logger"

This reverts commit 951db2510732d11ecef58f4a541371cbda48ffac [formerly 36bc243fffb3c76bba75a51dd79dd6a1031c262c].

Conflicts:

	openquake/kvs/__init__.py


Former-commit-id: 95d6bc59ede2713df156f6d8f6b575e808a6e562
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine