tool: change configurators from classes to modules.

Currently we have:
|-- configurators                    package
|   |-- certificates.py              module
|   |   |-- ModuleConfigure          class
|   |-- libvirt.py                   module
|   |   |-- ModuleConfigure          class
|   |-- sanlock.py                   module
|   |   |-- ModuleConfigure          class

I am suggesting to make this flatter:
|-- configurators                    package
|   |-- certificates.py              module
|   |-- libvirt.py                   module
|   |-- sanlock.py                   module

Defaults moved from the less visible __init__.py to
the configurators consumer. What was once named a ModuleConfigurer is now called
a configurator module.

Change-Id: Iff5d588cfbbcfe0d5f4a90d624d24f21ef4cc580
Signed-off-by: Mooli Tayer <mtayer@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34047
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>