supporting simple module deployment

this is just a stepping stone commit, still requiring a lot of rework

does not yet support options values, composed modules, jobs, or source/sink channels
Added ZooKeeperStreamDefinitionRepository

That is now instantiated within both redis-store.xml and memory-store.xml.

It will later be expanded to supplant those (the --store option will no longer be necessary).

The /streams endpoints in the REST API are now backed by this implementation.
Added support for Module undeployment

Implemented ZooKeeperStreamDefinitionRepository findAll methods needed to support 'stream list'

Removed RedisStreamDefinitionRepository and InMemoryStreamDefinitionRepository
Tests (work in progress)