Revert "Merge pull request #407 from amplab/revert-400-tachyon-14_2"

This reverts commit ae1ec636ba035dad0e7172462d717063ec6e4196, reversing
changes made to ac3a9ae34e48668e716c1933b7fc9642df4f5e02.
Use complete uri for ufsPaths.
Merge pull request #408 from calvinjia/tachyon-14_2_fix

[Tachyon-14] (Client) FIX