Add Quadlet key and disconnect relationship withr read-only
Update and add tests
Update man with new key
Remove the reference to VolatileTmpfs in the man page to reduce its
usage, since the same functionality can be achieved using the Tmpfs key
while keeping its support to maintain backward compatibility
Signed-off-by: Ygal Blum <ygal.blum@gmail.com>
Ygal Blum