Bump the version in cloudinit/version.py to 24.3 and
update ChangeLog.

…nical#5640)

If an instance in _routed-ip_ mode uses both IPv4 **and** IPv6, but
the IPv6 is listed (attached) first, the default IPv6 route may be
absent from the final network configuration for systems that do not
accept Router Advertisements.

This change fixes the problem by making sure that routes are
appended, not overwritten.

- Update upstream cloud-init config template for azurelinux distro
- remove modules that not currently supported azurelinux

Co-authored-by: minghe <rmhsawyer>

…mpl (canonical#5653)

Fixes lintian warning systemd-service-file-shutdown-problems. See [1,
2].

Remove superflous conditional additions of Conflicts=shutdown.target as
it is unconditionally added for every target.

[1] https://salsa.debian.org/lintian/lintian/-/blob/2.118.0/tags/s/systemd-service-file-shutdown-problems.tag
[2] systemd/systemd#11821

Drop unnecessary environment variable.

Fixes canonicalGH-5648

Bump the version in cloudinit/version.py to 24.3.1 and
update ChangeLog.

Setting TZ environment variable was introduced as a performance
optimization in 2016[1]. However, this optimization never worked,
because it introduced code which only runs when __name__ is "__main__".
This never happens when installed via setuptools - it gets imported
and executed by the "cloud-init" script.

The underlying issue was fixed at some point between Trusty and Bionic,
presumably in cPython or in glibc. The following reproducer of the
original issue will print multiple lines on an affected system.

strace /usr/bin/python3 -c 'import os; from datetime import datetime; print([datetime.now() for i in range(10)])' |& grep -e localt -e zonei

[1] https://code.launchpad.net/~raharper/cloud-init/+git/cloud-init/+merge/307722

- use canonical/lxd action in integration test
- optimize integration test to run faster and use less resources

Make cloud-init usable without pyserial for DataSources that do not use
it.

Move pyserial optional dependency to requirements-all.txt.
This has the effect of: setup.py / dh_python will not consider them as
required dependencies and serves as upstream documentation.

Install requirements-all.txt in tox.

Fixes SC-5637
US120

Initialization of IMDS is periodically exceeding the 120s limit on
instance launch. Increase the timeout to allow for this variance.
    
Update docs to reflect change.

$INSTANCE_ID is an environment variable that contains a reference
to the current instance id. Its use is no longer needed now that
we can use jinja templates with {{ v1.instance_id }}. Furthermore,
`cloud-init-per` is a better replacement for running scripts once
per instance.

In particular, this commit does the following:
- Add jinja templating functionality to boothooks to be consistent
  with other core user data types
- Document cloud-id and cloud-init-per as they were previously
  undocumented
- Replace all $INSTANCE_ID references in docs to either use
  {{ v1.instance_id }} or the `cloud-init-per` script
- Update documentation of $INSTANCE_ID to now be deprecated
- Update tests as necessary

Also verify that cloud-init status has a valid return code.

…onical#5671)

patches:
- d/p/keep-dhclient-as-priority-client.patch
- d/p/no-single-process.patch