The stock Ubuntu approach was inadequate. It would DHCP out every nic and take the fastest result, and no going back.
Now the CDC nic can frequently win that race.
First, rmmod cdc_ether, as a scenario that is completely right out.
But beyond that, let Ubuntu have one shot at multi-nic bringup. Beyond that, maintain a list of all link-up devices.
If the check should fail, then start doing one nic at a time, cycling through them.
Also, the openssl s_client timeout is painfully slow, use subshell and kill to speed up things.
Have block devices checked for identity information
in a loop with network source search.
Block devices may be delayed for various reasons. The previous method
could be bypassed by fast block device cutting off slow device
enumeration. It also incurred a delay for the network install
case.
It turns out that when busybox invokes openssl for
IPv4, it does not pass a servername field.
In this case, start amending arguments after '-verify' instead, to catch
the verify_ip argument correctly.
The busybox wget invocation of openssl is broken.
Override by stubbing it out to let openssl pick the verify
hostname instead of wget specified one, which is incorrect.
It may happen that the first pass at nics misses
a viable network interface due to slow link up
or slow spanning tree forwarding.
Repeat the loop through the interfaces to have follow
up chances at success.
