The initrd has no udev, so only modules init names get loaded, and
xhci_pci is a module in the Ubuntu kernel. USB 3 / USB-C ports were
therefore dead in the UEFI Blancco path and a Dell USB-C to RJ45 adapter
never appeared; init took the onboard e1000e port with no cable.
- modprobe xhci_pci and xhci_pci_renesas before the NIC drivers
- bring up interfaces inside the carrier wait too, since USB NICs
enumerate seconds after onboard ports
- on no-link, print each interface's driver and the NIC/firmware/link
kernel messages before dropping to a shell
Live kexec-initrd.img also now carries the NIC firmware set from the
Blancco 7.20 early cpio (rtl_nic, tigon, bnx2x, ...) under /lib/firmware.
The playbook build does not add it yet.
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