nuageinit: add update_sshd_config tests

nuageinit: add adddoas tests

nuageinit: add addsudo tests

nuageinit: add decode_base64 tests

nuageinit: Improvements for nuageinit

- Fix 'pkg update' usage:
- The function 'nuage:run_pkg_cmd(...)' adds the flag '-y', which
does not make sense with some commands such as 'pkg update',

nuageinit: Improvements for nuageinit

- Fix 'pkg update' usage:
- The function 'nuage:run_pkg_cmd(...)' adds the flag '-y', which
does not make sense with some commands such as 'pkg update',
causing an error when updating the repository catalogs.
- Fix typo 'ssh-authorized-keys -> ssh_authorized_keys' in
'nuageinit(7)' man page.
- Document 'ssh_authorized_keys' parameter.
- Use device configuration ID when no 'match' rule is specified:
- This is the default behavior of cloud-init when no match rule is
specified, so the device is configured anyway (even if it does not
exist). This greatly simplifies things, since in many cases
'if_vtnet(4)' is used, so there is no need to perform a comparison
with the MAC address.
- Document 'network' parameter:
- Add example to 'EXAMPLES' section.
- Set 'gateway[46]' only when 'addresses' is specified:
- To comply with the cloud-init specification, 'gateway4' and 'gateway6'
must only take effect when 'addresses' (or static configuration) is
specified.
- Use a separate function to check 'match' rules:
- This way, we can easily add new logic to new types of rules.
- Implement 'network.ethernets.{id}.match.name' parameter:
- But unlike cloud-init, which works with glob expressions (although it
depends on the network backend), this implementation takes advantage
of Lua pattern-matching expressions.

Also note that previously we were only concerned with one interface
matching, however, to be cloud-init-compliant, we need to configure
the matching interfaces (one or more).
- Set default router only once.
- Implement 'network.ethernets.{id}.wakeonlan' parameter.
- Implement 'network.ethernets.{id}.set-name' parameter.
- Implement 'network.ethernets.{id}.match.driver' parameter:
- Rename 'get_ifaces(...)' function as 'get_ifaces_by_mac(...)'.
- Add get_ifaces_by_driver(...) function.
- Implement 'network.ethernets.{id}.mtu' parameter.
- Implement 'nameservers' parameter.
- Use 'resolvconf(8)' to manipulate 'resolv.conf(5)'.
- Use 'tzsetup(8)' to set time zone.

Reviewed by: bapt@
Approved by: bapt@
Differential Revision: https://reviews.freebsd.org/D51643

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nuageinit: implement write_files

write_files is a list of files that should be created at the first boot

each file content can be either plain text or encoded in base64 (note
that cloudinit specify

nuageinit: implement write_files

write_files is a list of files that should be created at the first boot

each file content can be either plain text or encoded in base64 (note
that cloudinit specify that gzip is supported, but we do not support it
yet.)

All other specifier from cloudinit should work:
by default all files will juste overwrite exesiting files except if
"append" is set to true, permissions, ownership can be specified.
The files are create before packages are being installed and user
created.

if "defer" is set to true then the file is being created after packages
installation and package manupulation.

This feature is requested for KDE's CI.

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nuageinit: add test for the password

nuageinit: Lua check and lint files

Mostly white space, style, and luacheck compliance.

Signed-off-by: Jose Luis Duran <jlduran@gmail.com>

nuageinit: add basic support for cloudinit.

this is a very early script to support cloudinit, it does not intend to
be a full featured cloudinit client, but will support a good enough
subset to be v

nuageinit: add basic support for cloudinit.

this is a very early script to support cloudinit, it does not intend to
be a full featured cloudinit client, but will support a good enough
subset to be viable in most case.

It support nocloud and openstack config-2 config drive mode (iso9660 or
msdosfs)

The following features are currently supported:
- adding users (including a default user named 'freebsd' with password
'freebsd'
- adding groups
- adding ssh keys
- static ipv4, static ipv6, dynamic ipv4

With this one is able to use the 'bring your own image feature" out of
box.

It is expected that the script grows the support of other clouds
supporting cloud-init, contributions are welcomed.

It is designed to be only run once via the firstboot mecanism.

Sponsored by: OVHCloud
MFC After: 3 weeks
Differential Revision: https://reviews.freebsd.org/D44141

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