Update changelog for 1.2.0-rc2.

Revert "Revert "Use the stout ELF parser to collect rootfs files."".

This reverts commit 273aca1.

Review: https://reviews.apache.org/r/56472/

Updated Mesos version to 1.1.1.

Added all test dependencies to libprocess' tests target.

We rely on some additional tools beyond the currently listed being
present. Since they are already listed in `check_PROGRAMS` to make
`make check` work, just reuse that variable here instead of expanding
the full list by hand.

Review: https://reviews.apache.org/r/52677/

Added all test dependencies to libprocess' tests target.

We rely on some additional tools beyond the currently listed being
present. Since they are already listed in `check_PROGRAMS` to make
`make check` work, just reuse that variable here instead of expanding
the full list by hand.

Review: https://reviews.apache.org/r/52677/

Updated Mesos version to 1.0.3.

Added MESOS-5763 to 0.28.3 CHANGELOG.

Added MESOS-5763 to 0.28.3 CHANGELOG.

Updated ticket names in CHANGELOG for 1.1.0.

Updated ticket names in CHANGELOG for 1.1.0.