Fix webdav connection with Jboss distribution

The mapping to Nuxeo DM is failing for two reasons :

• we are using Framework.getService(DirectoryService.class) instead of Framework.getService(DirectoryService.class) to retrieve the directory service : this raises this error when trying to open a directory in Jboss

  ERROR [org.nuxeo.ecm.ui.web.auth.digest.DigestLoginPlugin] Digest authentication failed
  org.nuxeo.ecm.directory.DirectoryException: Directories cannot be remotely retrieved
      at org.nuxeo.ecm.platform.directory.ejb.DirectoryManagerBean.getDirectory(DirectoryManagerBean.java:321)
      ...
      at $Proxy422.getDirectory(Unknown Source)
      at org.nuxeo.ecm.ui.web.auth.digest.DigestLoginPlugin.getStoredHA1(DigestLoginPlugin.java:122)
  

• the login-digest-config.xml configuration file is missing