lintian: openpgp-file-has-implementation-specific-extension

[arif-ali]

Another one around debian package lintian, I don't think this is as critical one, but maybe a worth a look

P: avocado: openpgp-file-has-implementation-specific-extension [usr/share/doc/avocado/examples/tests/assets.py.data/gnu_hello_signer.gpg]
N: 
N:   The package includes an OpenPGP file with an implementation specific extension such as .gpg, instead of the more correct and neutral .pgp.
N:   
N:   The specification for this format is called OpenPGP, and the extension name that is short and considered implementation neutral is .pgp. While currently the GnuPG project is widely
N:   used and one of the most known OpenPGP implementations, using an extension after its name is detrimental to other alternative implementations, when a better more neutral name can be
N:   used instead.
N:   
N:   Note that many of these files are referenced externally, and as such should be considered an interface. Make sure to create backward compatibility symlinks for a smooth transition.
N: 
N:   Please refer to https://www.openpgp.org/ and https://www.rfc-editor.org/rfc/rfc4880 for details.
N: 
N:   Visibility: pedantic
N:   Show-Always: no
N:   Check: files/openpgp