redis: First draft of dbgen layer, simple clone of dropbox

Signed-off-by: Norman Scaife <norman.scaife@mlstate.com>
redis: Added missing driver and dbgen files

Signed-off-by: Norman Scaife <norman.scaife@mlstate.com>
[fix] compiler:  Fix for opalang in submodule, turns out .git is a file not a directory in a submodule
[fix] redis:  Switch off serialize for updates