HashTree and ListedHashTree fail to compile with Java 8
Rename replace as replaceKey to avoid clash with Java 8 Map.replace(K,V) mew method
Bugzilla Id: 56360


git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1586693 13f79535-47bb-0310-9956-ffa450edef68