TEST: New tests for negative caching of locals Negative cache has special timeout for local entities (users, groups). This patch adds new tests for such behaviour. The tests are based on cwrap. Resolves: https://fedorahosted.org/sssd/ticket/2928 Reviewed-by: Pavel Březina <pbrezina@redhat.com>

TESTS: Add a test to change user IDs Adds a unit test using the nss_wrapper and uid_wrapper libraries that exercises the ability to become another user. Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>