[SPARK-2548][HOTFIX][Streaming] Removed use of o.a.s.streaming.Durations in branch 1.1

Author: Tathagata Das <tathagata.das1565@gmail.com>

Closes #3188 from tdas/branch-1.1 and squashes the following commits:

f1996d3 [Tathagata Das] [SPARK-2548][HOTFIX] Removed use of o.a.s.streaming.Durations