DataSourceOracle: configure secondary NICs on Virtual Machines

Oracle Cloud Infrastructure's Instance Metadata Service provides network
configuration information for non-primary NICs.  This commit introduces
support, on Virtual Machines[0], for fetching that network metadata,
converting it to v1 network-config[1] and combining it into the network
configuration generated for the primary interface.

By default, this behaviour is not enabled.  Configuring the Oracle
datasource to `configure_secondary_nics` enables it:

    datasource:
      Oracle:
        configure_secondary_nics: true

Failures to fetch and generate secondary NIC configuration will log a
warning, but otherwise will not affect boot.

[0] The expected use of the IMDS-provided network configuration is
    substantially different on Bare Metal Machines, so support for that
    will be addressed separately.
[1] This is v1 config, because cloudinit.net.cmdline generates v1 config
    and we need to integrate the secondary NICs into that configuration.

0 files changed, 0 insertions, 0 deletions