Fixed libprocess tests to write to stderr when using newer versions
of autotools.

Review: https://reviews.apache.org/r/11877
Fixed mesos tests to write to stderr when using newer versions of
autotools.

Review: https://reviews.apache.org/r/11878
Fixed a bug in the Slave's logging.
Added logging for failed detection of system resources in the slave.

Review: https://reviews.apache.org/r/11885
Update deploy scripts.

This modifies the deploy scripts to work now that --conf is not
longer supported. Instead, the deploy scripts source mesos-master-env.sh
and mesos-slave-env.sh files to pass environment variables to
the masters and slaves.

Review: https://reviews.apache.org/r/11891/
Added os::sysctl to stout.

Review: https://reviews.apache.org/r/11895