* test/net/imap/test_imap.rb: remove unused variables.
* test/net/imap/test_imap_response_parser.rb: ditto.
* test/net/pop/test_pop.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45149 b2dd03c8-39d4-4d8f-98ff-823fe69b080e