Convert MeetingJobs methods to top-level functions

Having MeetingJobs methods remain as class methods unnecessary
requires a MeetingJobs object to be instantiated before they
can be invoked. Each of these class methods has been converted
to corresponding top-level functions in the jobs module.

In addition, constant variable defintions have been moved from
the jobs module to the const module. Some variable names for
constant variables in the const module have been prepended with
'DEFAULT_', since future patches will allow for these values
to be optionally overriden by command-line parameters.

Change-Id: I884ea95f56fca56dd4ae697d67e8b592e30aa998
Merge "Convert MeetingJobs methods to top-level functions"