Make ganeti-noded create BDEV_CACHE_DIR automatically
Currently in order to deal with tmpfs /var/run, we create the
BDEV_CACHE_DIR in the init script. However, that does not cover all the
cases, and it's not a proper place to deal with it: for example, dealing
with not initialized clusters and the master node is more complicated.
Therefore, this patch does:
- make ganeti-noded create the directory automatically
- make ganeti-noded error out if it can't create it or it's already
there but not a directory
- remove the creation from the init.d script
Reviewed-by: ultrotter