Delete framework data in TaskStatus to avoid OOM

There was a bug found that Spark use TaskStatus.data to transfer computed
result and mesos-master RES memory keeps increasing fast and finally will be
killed by OOM killer.

Review: https://reviews.apache.org/r/25184
Minor style fix from https://reviews.apache.org/r/25184/
Added --modules flag for Mesos slave.

Review: https://reviews.apache.org/r/26509
Replaced cerr/exit with EXIT when parsing master flags.

Review: https://reviews.apache.org/r/26629
Fixed minor typos in configure.ac.

Review: https://reviews.apache.org/r/26728