Added DROP_PROTOBUF(s), AWAIT_READY and AWAIT_FOR_READY to test utils.

Review: https://reviews.apache.org/r/10313

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1465843 13f79535-47bb-0310-9956-ffa450edef68
Fixed master tests to use AWAIT_READY.

Review: https://reviews.apache.org/r/10314

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1465844 13f79535-47bb-0310-9956-ffa450edef68
Fixed reaper tests to use the latest test abstractions.

Review: https://reviews.apache.org/r/10315

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1465845 13f79535-47bb-0310-9956-ffa450edef68
Fixed fault tolerance tests to use the latest test abstractions.

Review: https://reviews.apache.org/r/10316

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1465846 13f79535-47bb-0310-9956-ffa450edef68
Fixed slave recovery tests to use the latest test abstractions.

Review: https://reviews.apache.org/r/10325

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1465847 13f79535-47bb-0310-9956-ffa450edef68