The current min/max resvport settings are independently limited
by the entire range of allowed ports, so max_resvport can be
set to a port lower than min_resvport.

Prevent inversion of min/max values when set through sysctl by
setting the limits dependent on each other.
Signed-off-by: NFrank Sorenson <sorenson@redhat.com>
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>