Exclude @SecurityTest tests from CTS. These are tested in STS.

Bug: 180417031
Test: cts-tradefed run collect-tests-only -m CtsSecurityTestCases
Test: cts-tradefed run collect-tests-only -m CtsSecurityBulletinHostTestCases
Change-Id: I57730cccacf29469a041aa759139e29643d603ac
1 file changed