Add high performance Oracle connector into Sqoop

Dell Software is contributing an Oracle connector for the Sqoop project. We had a discussion about this on the mailing list (http://markmail.org/thread/42tlyjzg5ip245jq), and also a vote (http://markmail.org/thread/wjxpv6zxeo2ioaqj). The results of the vote are here http://markmail.org/message/366aqe6rqy4yji6j