OAK-1027: Avoid turning multivalued properties to String arrays

Replace String[] with Iterable<String> as getStrings() and getNames() return value

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1524804 13f79535-47bb-0310-9956-ffa450edef68
OAK-641: Improved benchmark tooling

Use unicode box drawing characters in analyze-hprof.pl

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1524805 13f79535-47bb-0310-9956-ffa450edef68