Relicense the project to LGPL-2.1-or-later

[mwperina]

As a part of contributing the project to Eclipse Foundation we need to
relicense the project from GPL-2.0-or-later to LGPL-2.1-or-later.

Fixes: #462
Signed-off-by: Martin Perina [email protected]

[mwperina]

IMPORTANT:

• DO NOT MERGE UNTIL Change the project license to LGPL-2.1-or-later #462 IS FULLY APPROVED
• BEFORE MERGING REBASE MANUALLY AND RUN FOLLOWING COMMANDS TO MAKE SURE NO FILE CONTAINS INVALID LICENSE

  ./build-scripts/spdx-header-check.sh
  git grep GPL | grep -v 'LGPL-2.1'
  git grep 'SPDX-License-Identifier' | grep -v 'LGPL-2.1' | grep -v 'CC0-1.0'

[rhatdan]

LGTM

[dougsland]

LGTM

[rhatdan]

Please remove DRAFT flag.

[engelmi]

IMPORTANT:

* DO NOT MERGE UNTIL [Change the project license to LGPL-2.1-or-later #462](https://github.com/containers/bluechi/issues/462) IS FULLY APPROVED

* BEFORE MERGING REBASE MANUALLY AND RUN FOLLOWING COMMANDS TO MAKE SURE NO FILE CONTAINS INVALID LICENSE
  ```shell
  ./build-scripts/spdx-header-check.sh
  git grep GPL | grep -v 'LGPL-2.1'
  git grep 'SPDX-License-Identifier' | grep -v 'LGPL-2.1' | grep -v 'CC0-1.0'
  ```

We now have all necessary approvals in #462.
I've also run the commands listed and checked manually again to make sure no file is missing.
Removing the draft status.

[ygalblum]

LGTM