* cc_ssh: fix capitalisation of SSH

* doc: fix capitalisation of SSH

* cc_keys_to_console: fix capitalisation of SSH

* ssh_util: fix capitalisation of SSH

* DataSourceIBMCloud: fix capitalisation of SSH

* DataSourceAzure: fix capitalisation of SSH

* cs_utils: fix capitalisation of SSH

* distros/__init__: fix capitalisation of SSH

* cc_set_passwords: fix capitalisation of SSH

* cc_ssh_import_id: fix capitalisation of SSH

* cc_users_groups: fix capitalisation of SSH

* cc_ssh_authkey_fingerprints: fix capitalisation of SSH

This has been a recurring ask and we had initially just made the change to
the cloud-init 2.0 codebase.  As the current thinking is we'll just
continue to enhance the current codebase, its desirable to relicense to
match what we'd intended as part of the 2.0 plan here.

- put a brief description of license in LICENSE file
- put full license versions in LICENSE-GPLv3 and LICENSE-Apache2.0
- simplify the per-file header to reference LICENSE
- tox: ignore H102 (Apache License Header check)

Add license header to files that ship.
Reformat headers, make sure everything has vi: at end of file.

Non-shipping files do not need the copyright header,
but at the moment tests/ have it.

Instead of aborting all serial using tests instead just
create a serial module in cloudinit that will create a fake
and broken serial class when pyserial is not actually installed.

This allows for using the datasource and tests that exist in
a more functional and tested manner (even when pyserial is not
found).

 * do not run dmidecode on arm.
 * line length
 * comment that 60 second time out is expected