net: update net sequence, include wait on netdevs, opensuse netrules path

On systems with many interfaces, processing udev events may take a while.
Cloud-init expects devices included in a provided network-configuration
to be present when attempting to configure them.  This patch adds a step
in net configuration where it will check for devices provided in the
configuration and if not found, issue udevadm settle commands to wait
for them to appear.

Additionally, the default path for udev persistent network rules
70-persistent-net.rules may also be written to systems which include
the 75-net-generator.rules.  During boot, cloud-init and the
generator may race and interleave values causing issues.  OpenSUSE
will now use a newer file, 85-persistent-net-cloud-init.rules which
will take precedence over values created by 75-net-generator and
avoid collisions on the same file.

LP: #1817368

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