Add a conditional sleep 1 in case we add any IPv6 addresses to interfaces. Do this per jail started, not per address.  This will allow DAD to complete and services to properly start.   Before we have seen problems with services trying to start before the IPv6 address was available to use and thus erroring and failing to start.
Add a conditional sleep 1 in case we add any IPv6 addresses to interfaces.
Do this per jail started, not per address.  This will allow DAD to complete
and services to properly start.   Before we have seen problems with services
trying to start before the IPv6 address was available to use and thus
erroring and failing to start.

MFC after:	3 days

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