CLOUDSTACK-1535: kvm agent will silently ignore many exceptions
Current kvm agent will silently ignore many exception, and there's no
way to see what really happened. This patch will log in trace level log
that was silently ignored. And also, it will fix huge bare Exception
catch, which is very harmful because it also catches RuntimeException.
debian: Only include JAR files into the classpath
packaging: Include the Agent plugins dir in the classpath

For both the RPM and DEB packages are new directory for plugins
for the agent is created.

All JAR files in that directory will be added to the classpath
on boot of the agent.
debian: Use some more variables in the rules file

Makes changes easier and it less hard coded.
CLOUDSTACK-1407:add primary storage screen throught UI doesn't have scope field