Redis: optional pipelining and better tested transactions
Don't need ref string; use PPipeline instead of ref TPipeline
factor per comments
delete echo statements used for debugging
Allow QUEUED reply only if pipelined; don't return status replies from flushPipeline; Rewrite someTests
delete extra statement from debugging
Use enum
Merge pull request #1076 from runvnc/redis_pipeline

Redis: optional pipelining and better tested transactions