Use TRIVIAL-PACKAGE-LOCKS:WITH-LOCKED-PACKAGES

[phoe]

17:50 < yitzi> ::notify phoe I saw in your trivial-package-local-nicknames test suite that one of the 
               tests locked a package and then verified that adding nicknames would fail while the 
               package was locked. I've added a WITH-LOCKED-PACKAGES macro to trivial-package-locks 
               that may help for that use case.