added two vm's to Vagrantfile, mon-build that builds the ossec server deb package
and app-build that builds the ossec agent and the seuredrop-app-code deb packages
removed installing the built deb packages for in the build-* roles
gave the two build vm separate names to avoid issues with name conflicts.
Merge pull request #699 from dolanjs/build-vm

Temp solution for testing local deb packages