SLING-3086 - [Tooling] proper handle xml-encoded path-parts

Decode node names using the ISO9075 format when handling a full coverage
aggregate.

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1524739 13f79535-47bb-0310-9956-ffa450edef68