Added two classed to implement two basic application workflows:
installation and software configuration, with appropriate error
handling, reporting, event-based notifications and so on. A class
called 'SoftwareComponent' inherits both these classes and is able to
run these two workflows sequentially to install and configure software
on given Instance Groups.
Change-Id: Ic0c1bbad1f0e3ae71b339c56db245075bcc420ac
Targets-blueprint: application-development-framework
ef85e7ead9