dist: fix incorrect license on rpm & deb packages

[syuu1228]

No description provided.

[syuu1228]

I found that since we switched our license from AGPL-3.0 to Apache at e4116ac, we mistakenly not updated dist/debian/debian/copyright.
So it sill AGPL-3.0 until now, we don't need to update dist/debian to switching license.

[syuu1228]

Test passed: https://jenkins.scylladb.com/job/scylla-master/job/releng-testing/job/next-machine-image/405/

[yaronkaikov]

@avikivity @mykaul please have a look

[avikivity]

Why to AGPL? Better to Apache license, we don't want to restrict use here.

[syuu1228]

I opened this PR because of the request from @yaronkaikov, which was:

Do you have any idea how to modify the license for scylla-machine-image from AGPL to APACHE ?
Can you update about the license change for scylla-machine-image?

So I think current patch is doing opposite.
@avikivity We want use Apache-2.0 instead of AGPL-3, right?

Current license is already Apache-2.0 so it's basically nothing to do here.
But I found one exception:

dist/debian/debian/copyright is still says this code is licensed under AGPL-3.
So I guess we should change this file to Apache-2.

[avikivity]

Yes let's change the leftover to Apache2

[syuu1228]

Fixed incorrect license on .deb and .rpm.