Fix devfs cloning for non-superusers when net.link.tap.user_open is non-zero. Note: 'ifconfig tapX create' still requires PRIV_NET_IFCREATE privilege.
Fix devfs cloning for non-superusers when net.link.tap.user_open is non-zero.
Note: 'ifconfig tapX create' still requires PRIV_NET_IFCREATE privilege.

Reviewed by:	rwatson

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase