private StringBuilder addUserDir(StringBuilder jvmArguments) {
		jvmArguments.append(" -Duser.dir=").append(baseDirectory.getFile().getPath()).append(" ");
		return jvmArguments;
	}
Rebase class path from relative path to absolute path.

@param classPath class path
@return converted path.
ngrinder-core/src/main/java/net/grinder/engine/agent/PropertyBuilder.java