Tests: Remove SSSD restart from integration tests
SSSD restart has been mistakenly added to integration tests
(test_integration/tasks.py::uninstall_master). When system setup is correct,
this restart has no significance, moreover it makes tests fail, hence its
removal is necessary.
https://fedorahosted.org/freeipa/ticket/6338
Reviewed-By: Oleg Fayans <ofayans@redhat.com>