fixes #6607 / BZ 1106565 - Content View Package Filter Rules - allow duplicate name

Prior to this commit, a user could not create multiple package filter
rules for the same package (i.e. name) but different specific versions.

For example, if a repo had the following packages:
  package-0:1.0.0
  package-0:2.0.0
  package-0:3.0.0
  package-0:4.0.0

A user could not create rules to include/exclude the following packages:
  package-0:2.0.0
  package-0:4.0.0

With this commit, a user may now do that.