MFC r321702,r321703:

r321702:

Load geom_gate(4) if necessary before running tests; skip if it can't be loaded

The test code prior to r311893 loaded geom_gate at test start if necessary and
skipped the tests if it couldn't be loaded.

The ATF-ifcation of this test done in r311893 unfortunately dropped this
functionality.

This change restores the geom_gate module load and skips the test(s) if unavailable
in an ATF-like way.

PR: 220164

r321703:

Remove superfluous exit 0 added in r321702

atf_skip triggers equivalent functionality, which means the exit 0
is unreachable code.

PR: 220164
MFC with: r321702