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] redis:  Fix header in code generator
[fix] redis:  Fix for compilation as submodule