Fix tests in CI

Fix tests in CI

It skips tests when information on current running user is unavailable.
Local IP address is retrieved by lookup of "localhost". IP addresses are
used instead of nil values.

Interface of uuid package has been changed so code using it has been
adapted.

Mock generated for stm.Interface has been updated.

Change-Id: Ide48575fa7a589c0cad00478898c2a651fda77d5
Signed-off-by: Aleksander Mistewicz <a.mistewicz@samsung.com>