In this patch, we did the following changes:
1. Duplicate executable file 'mesos-slave' with 'mesos-agent'
2. Rename the scripts in folder 'mesos/bin' & 'mesos/src/deploy'
to use term 'agent' instead of term 'slave'
3. Change the content of ths scripts to use term 'agent' instead
of term 'slave'
4. Duplicate the renamed scripts renamed in #2 during the configure
and make process, the duplicated scripts still use term 'slave'
in their names.
Please note that a re-bootstrap is required once this patch has
been applied. Otherwise, configure will break because of the
missing mesos-slave-*.sh scripts.