contrib/mdv.spec: adapt to 3.6 series, let it build as "experimental"
libcfnet: allow bufsize == MAX_BUFSIZE + 1 on Receive

The receive buffer may have +1 byte allocated, allow that while limiting
the packet len <= MAX_BUFSIZE
cf-agent: allow bootstrapping in user mode (non-root)

We may want to use CFEngine as non-root. That limitation of boostrapping
would completely block such a scenario.