Node address port fixes

[neoaggelos]

Summary

Fixes around the node microcluster address and port

Changes

• Remove ListenPort config from the microcluster app configuration, and deprecate the --port k8sd argument. This port is the default HTTPS port for the microcluster app, before the node is bootstrapped. After bootstrapping, this is unused, and the node address specified is used instead.
• Automatically add the default port (6400), if only the node address is specified during bootstrap (e.g. via k8s bootstrap --address 1.1.1.1)

[github-actions]

Package	Line Rate
github.com/canonical/k8s/api/v1	48%
github.com/canonical/k8s/cmd/k8s	27%
github.com/canonical/k8s/cmd/util	14%
github.com/canonical/k8s/pkg/client/dqlite	44%
github.com/canonical/k8s/pkg/component	9%
github.com/canonical/k8s/pkg/k8sd/api	2%
github.com/canonical/k8s/pkg/k8sd/controllers	67%
github.com/canonical/k8s/pkg/k8sd/database	48%
github.com/canonical/k8s/pkg/k8sd/pki	55%
github.com/canonical/k8s/pkg/k8sd/setup	70%
github.com/canonical/k8s/pkg/k8sd/types	62%
github.com/canonical/k8s/pkg/proxy	6%
github.com/canonical/k8s/pkg/snap	14%
github.com/canonical/k8s/pkg/snap/util	90%
github.com/canonical/k8s/pkg/utils	31%
github.com/canonical/k8s/pkg/utils/control	61%
github.com/canonical/k8s/pkg/utils/errors	100%
github.com/canonical/k8s/pkg/utils/k8s	69%
Summary	32% (1702 / 5345)

[berkayoz]

LGTM