Add specific INTEGRITY cases for autotests requiring a target path.

Add specific INTEGRITY cases for autotests requiring a target path.

SRCDIR is not parsed the same way due to the different qmake generation process.
furthermore, the full host path doesn't seem like a good idea to use for the path of the target filesystem.
Use "/" as default.

Merge-request: 1438
Reviewed-by: Harald Fernengel <harald.fernengel@nokia.com>