The list of packages (in "." format, i.e. "com.acme.test.services")
that we should scan through the classpath for in order to find services. This
annotation must be placed on a class that extends HK2Runner
Returns the set of packages (with dot separator)
that should be scanned for hk2 services. The
default value for this is to scan the package in
which the test class itself resides