Add NuGet target to restore NuGet packages.  Allows build to fetch
packages automatically.
Remove method call not supported by Mono.
Add profile to build Hyper-V Agent using Mono.
Activate by adding -P hyperv-agent to the mvn build.  e.g.
mvn clean install -P hyperv-agent
Add profile that triggers Mono build of Hyper-V agent.
Profile is 'hyperv-agent', e.g.
mvn clean build -P hyperv-agent