Fix nuxeo-distribution-tools resolution of artifacts from repositories

For instance, when building nuxeo-distribution with maven profile "jboss,nuxeo-ep", resolution is not done correctly as artifact "nuxeo-distribution-resources-5.3.2-20100426.120042-28-doc.zip" does not exist on the "public-snapshot" repository:

prepare-jboss:
[unzip] Expanding: /home/anahide/.m2/repository/org/jboss/jboss-as/4.2.3.GA/jboss-as-4.2.3.GA-light.zip into /home/anahide/workspaces/nuxeo-correspondence/nuxeo-correspondence-distribution/ftest/selenium/nuxeo-distribution/nuxeo-distribution-jboss/target/jboss.tmp
[unzip] [INFO] snapshot org.nuxeo.ecm.distribution:nuxeo-distribution-resources:5.3.2-SNAPSHOT: checking for updates from public-snapshot
Downloading: http://maven.nuxeo.org/public-snapshot/org/nuxeo/ecm/distribution/nuxeo-distribution-resources/5.3.2-SNAPSHOT/nuxeo-distribution-resources-5.3.2-20100426.120042-28-doc.zip

BUILD FAILED
/home/anahide/workspaces/nuxeo-correspondence/nuxeo-correspondence-distribution/ftest/selenium/nuxeo-distribution/nuxeo-distribution-jboss/src/main/assemble/assembly.xml:38: The following error occurred while executing this line:
/home/anahide/workspaces/nuxeo-correspondence/nuxeo-correspondence-distribution/ftest/selenium/nuxeo-distribution/nuxeo-distribution-jboss/src/main/assemble/assembly.xml:58: Failed to resolve file: org.nuxeo.ecm.distribution:nuxeo-distribution-resources:5.3.2-SNAPSHOT:zip; classifier: doc