CLOUDSTACK-7215: Make expunge=True as default parameter value while calling destroyVirtualMachine through base library

Signed-off-by: Santhosh Edukulla <santhosh.edukulla@gmail.com>
added tools/marvin/build to gitignore
Fixed few coverity issues for resource synchronization
vGPU automation changes to make use of existing windows 8 template in the setup to deploy vGPU VMs