Skip downloading when use drill-fmpp-maven-plugin

**Is your feature request related to a problem? Please describe.**
We are using drill-fmpp-maven-plugin in IoTDB project. However, drill-fmpp-maven-plugin will download some useless xml files, which takes too much time when the network is poor.

**Describe the solution you'd like**
Remove the logic of downloading these xmls in drill-fmpp-maven-plugin.

**Additional context**