@SuppressWarnings("SameParameterValue")
	void addProperties(String key, String value) {
		this.properties.put(key, value);
	}
Rebase Host String.. add the missing ip addresses if only host is
provided..

@param hostString host string
@return completed host string.
ngrinder-core/src/main/java/net/grinder/engine/agent/PropertyBuilder.java