fix master branch
CLOSED - CURRENTRELEASE
It looks like commit 409687edaa792427c7876c815d517b66f05fe25d is present on both 2.10-dev and master branches. However, the code associated with that commit is only present on the 2.10-dev branch.
We should figure out what all is missing from master branch in pulp_rpm and make a commit to bring those changes back.
Reclassify signature verification as signature and key ID filtering
This is a cherry-pick of 409687edaa792427c7876c815d517b66f05fe25d, which I didn't merge forward properly to master. :(
The features introduced in #1991 (https://pulp.plan.io/issues/1991) only act as filters based on whether or not a package is signed, and the short key ID of the key used to generate that signature. This changes any reference to "verification" introduced with those changes to "GPG Key ID filtering", and in general attempted to clarify that this is not a security feature, while still leaving it possible to (hopefully) do GPG package signature verification in a future version.
fixes #2188 https://pulp.plan.io/issues/2188