Updated the CHANGELOG and upgrades documents for MESOS-1409.
Fixed a bug in docker/docker.cpp that causes unresolved symbols on OSX.

Review: https://reviews.apache.org/r/24825
Fixed master to reject completed frameworks from re-registering.

Review: https://reviews.apache.org/r/20507
Enabled glog signal handler for mesos tests.
Enabled glog signal handler for libprocess tests.
Enabled glog signal handler for stout tests.
Fixed help string for "--attributes" flag.

Review: https://reviews.apache.org/r/24840
Fixed "registered" value in slave's /stats.json.
Add docker image to executor cli