Enhancements to the SNAPS orchestrator/launcher

Enhancements to the SNAPS orchestrator/launcher

Added support for more Ansible substitution values extracted
from OpenStack instances (i.e. subnet broadcast address, router
external IP for gateway configuration, CIDR IP, netmask, etc.)

Removed most try/except blocks to ensure processing does not
continue when a problem should arise

Added the ability to know when cloud-init has completed

Removed nic configuration from OpenStackVmInstance as userdata/
cloud-init/cloud-config should be performing that functionality

Fixed some logging messages

Misc launcher bug fixes

Change-Id: I73e7607ee158cce3d16f9c1c1fc7c32ef5899a1d
Signed-off-by: spisarski <s.pisarski@cablelabs.com>