SOLR-4650: make BadCopyFieldTest extend AbstractBadConfigTestBase, which handles exceptions properly and deletes the core init'd to test config (merged trunk r1462522)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1462524 13f79535-47bb-0310-9956-ffa450edef68