Skip the test if cannot open ctrl file

The shell access to the proc/xt_qtaguid/ctrl file is blocked in next
android release since no apps or users should directly read/write to
those proc files anymore. This CTS test is checking some critical kernel
behavior to make sure the xt_qtaguid module have specific kernel fixes.
So if the ctrl file is not accessible, there is no way to verify those
critical fixes, we can only skipped the test. These testcases are also
added in VTS qtaguid test so we can still check the devices have those
kernel fixes.

Bug: 110906349
Test: atest CtsNativeNetTestCases
Change-Id: Iae0512bb37f8b93577a134f15affb4f2a448be18
1 file changed