Preliminary toollabs module

Preliminary implementation of the toollabs module that implements
the Tool Labs instance roles.  At this time, only the structure
and some packages are in place.

Important note: those classes are interdependent and cross-
configure each other through a shared filesystem (exec hosts push
they configurations for the master to collect, submit hosts pick
the queue information from the master and shadow, and so on).

Change-Id: Ic9595f375ece581bf41ceff44e9d14a7bdfcd70c
Merge "Preliminary toollabs module" into production