when list of included GAV patterns is empty, search for all
optimize listing repositories when included GAV list contains "nice" regular expresions

eg. when included GAV list contains:
  "r/org\.jboss\.as:core-.*:7\..*/"
  "r/org\.weld:.*:.*"
check only paths:
  "org/jboss/as/",
  "org/weld/"