src/context: create the data directory on startup
src/context: create the data directory on startup

This allows us to detect configuration errors earlier and avoids problems where
other parts of RAUC expect this to exist.

Signed-off-by: Jan Luebbe <3a82f1ac4ad59607a20f180f1c67ac8ba31ad0d5@pengutronix.de>

ejoerns/rauc,rauc/rauc,rauc/rauc,jluebbe/rauc,rauc/rauc,ejoerns/rauc,ejoerns/rauc,jluebbe/rauc,jluebbe/rauc