CtsHardwareTestCases: Fix for #testGetParameterDuringFocus

- After calling 'autoFocus()' for a second time, the test
  was neither waiting for the focus to finish, nor
  canceling AF, before calling 'autoFocus()' yet again.
  This sequence will inevitably lead to an error.

bug:5314001

Change-Id: I259ff5b1e2e4385c325f19536a519db4ac2c3acf
Original-author: Emilian Peev <epeev@mm-sol.com>
Signed-off-by: Emilian Peev <epeev@mm-sol.com>
Signed-off-by: Tyler Luu <tluu@ti.com>