sprinkle sleep

http://172.19.49.85/view/arakoon-git/job/arakoon-amplidata-git-system-tests-QUICK/34/testReport/junit/arakoon_system_tests.server.quick/system_tests_basic/test_start_stop_single_node_forced/
http://172.19.49.85/view/arakoon-git/job/arakoon-amplidata-git-system-tests-QUICK/37/testReport/junit/arakoon_system_tests.server.quick/system_tests_basic/test_start_stop_three_nodes_forced/