ueventd: fixup ueventd_test.cpp

Use ASSERT_EQ() instead of EXPECT_EQ() to prevent segfaults after
failed API calls.

Do not run setfscreatecon_IsPerThread unless we're in permissive mode
as it will not pass otherwise.

Test: init unit tests
Change-Id: I70525d438e89f1ec036255890169a50b5007b4c4