[regression] Plugin dependencies are not downloaded from repos given in the plugin's POM

[ERROR] Unresolveable build extensions: Missing:
----------
1) javanettasks:javanettasks:jar:1.0.12

  Path to dependency:
        1) org.jvnet.hudson.tools:maven-hpi-plugin:maven-plugin:1.14
        2) javanettasks:javanettasks:jar:1.0.12

----------
1 required artifact is missing.

for artifact:
  org.jvnet.hudson.tools:maven-hpi-plugin:maven-plugin:1.14

from the specified remote repositories:
  central (http://repo1.maven.org/maven2, releases=true, snapshots=false),
  java.net2 (http://download.java.net/maven/2, releases=true, snapshots=false)
 @ net.fredjean.ws7:ws7:1.0-SNAPSHOT (M:\hudson\plugins\ws7\pom.xml)