Retire deprecations for constants, exceptions, attributes

Subprojects have had enough time to switch to neutron-lib for
the deprecated items from these modules.

Change-Id: Ib2f4acf7e0153667389c57a52f2db33a23758b24
1 file changed
tree: b1d4464904b0459bc48037a7dfef5138482ff899
  1. neutron/