fix 988 remove unnessary unpack execution from pom file in bridge project

This is a fix for #988.  In reef-bridge-clr, there is no java code, so there is nothing to unpack when doing "mvn test". This PR remove those unnecessary unpack executions from pom files. In addition, an unsigned driver dll is included to make it easier to develop-and-test, we will have a separate bridge-release branch that will use the signed driver dll.