Refresh: stop refreshes in action

If a refresh happens while another refresh is occuring, make sure
that that old refresh is cancelled. In addition to this, remove some
old logic that conflicted with itself. Also, keep ahold of the previous directory
before running the task.

Ticket: QRDL-1002
Change-Id: Ibc1f3d468243bc124d3baf259af21464f3c03c84
(cherry picked from commit 080405b5)