[SPARK-9199] [CORE] Update Tachyon dependency from 0.6.4 -> 0.7.0

No new dependencies are added. The exclusion changes are due to the change in tachyon-client 0.7.0's project structure.

There is no client side API change in Tachyon 0.7.0 so no code changes are required.

Author: Calvin Jia <jia.calvin@gmail.com>

Closes #7577 from calvinjia/SPARK-9199 and squashes the following commits:

4e81e40 [Calvin Jia] Update Tachyon dependency from 0.6.4 -> 0.7.0