- changed diag.sh to be able to start/stop/clean a redis server
- added helper functions in diag.sh to be able to query a redis server instance
- added new tests for imhiredis module to check
- that the queue mode works, with both lpop and rpop
- that the module is capable of handling a redis server going down
- that the module is capable of handling a redis server that appears afterwards
- that the subscribe mode works
