public void setProps(Properties props) {
    this.props = props;
  }
Resolves the given property string either from system properties or given properties. and
returns the replacement of the property found in available properties. If no string replacement
is found then {@link IllegalArgumentException} would be thrown based on
<code>ignoreUnresolvedProperties</code> flag being set by {@link CacheXmlParser}.
geode-core/src/main/java/org/apache/geode/internal/cache/xmlcache/CacheXmlPropertyResolver.java