Merge pull request #2630 from chrisvest/2.0-migrator-test-isolation

Fix test isolation failures in StoreMigratorIT
Updated UDC disable docs
Make LogExtractor AutoCloseable
Close LogExtractor in test
Merge branch '2.0-maint' into 2.0-migrate-legacy-lucene-log

Conflicts:
	community/kernel/src/test/java/org/neo4j/kernel/impl/storemigration/StoreMigratorIT.java