Ignore pmd generated files during license check
Ignore pmd generated files during license check

This has been happening for the NSX and BigSwitch plugins.
The maven build prints something like:
  [WARNING] Unknown file extension: .../plugins/network-elements/nicira-nvp/.pmd
  [WARNING] Missing header in: .../plugins/network-elements/nicira-nvp/.pmdruleset.xml

GabrielBrascher/cloudstack,wido/cloudstack,jcshen007/cloudstack,resmo/cloudstack,wido/cloudstack,DaanHoogland/cloudstack,DaanHoogland/cloudstack,resmo/cloudstack,resmo/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,resmo/cloudstack,jcshen007/cloudstack,wido/cloudstack,resmo/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,jcshen007/cloudstack,resmo/cloudstack,GabrielBrascher/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,wido/cloudstack,jcshen007/cloudstack,wido/cloudstack,DaanHoogland/cloudstack,DaanHoogland/cloudstack,resmo/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,GabrielBrascher/cloudstack