power_LoadTest: custom tasks param allows for parallel tasks

The 'tasks' param in power_LoadTest allows tasks to be specified as a
combination of sequential and parallel tasks.  See comments in control
file.

BUG=chromium-os:13437
TEST=Add "tasks=tasks" to the init function and run the test

Change-Id: Id1e094b9e29b7cd4074223d3ede96f1fc3511c33
Signed-off-by: Simon Que <sque@chromium.org>

Review URL: http://codereview.chromium.org/6691048
4 files changed