Remove oraclejdk7
Remove oraclejdk7

Travis no longer supports oraclejdk7 because Oracle installers stopped
working. https://github.com/travis-ci/travis-ci/issues/7884#issuecomment-308451879

yapei123/jedis,sazzad16/jedis,RedisLabs/jedis,mosoft521/jedis,xetorthio/jedis,RedisLabs/jedis,xetorthio/jedis,sazzad16/jedis,mosoft521/jedis,yapei123/jedis