Use new yakonfig configuration description
Fully switch over to yakonfig global config

AbstractStorage calls yakonfig.get_global_config('yakonfig') and every
storage implementation has its self._config filled in by the ctor
Explicit pytest-diffeo version dependency

for redis_address "fixture" (we use it oddly)
causing test configs to get included in kvlayer package
fixing `make install`
Merge branch 'switch-to-instance-collection'

In particular, this changes kvlayer.client() to use the global yakonfig
configuration and not take an explicit config parameter.