Upgrade the studio replication script used by support for Kendoo

Doc is there https://wiki.nuxeo.com/display/Connect/Support
Changes to perform:

• we should provide an API to clear the cache on all Nuxeo nodes for a given project https://connect.nuxeo.com/nuxeo/site/studio/api/v2/project/vif-plim/clear-cache
  here: https://github.com/nuxeo/nuxeo-studio/blob/master/nuxeo-studio-web/src/main/java/com/nuxeo/studio/web/v2/ProjectRoot.java
  (Basic Auth is fine, a restriction to Nuxeo+Admin users would be a good idea)
• support people should be able to use the script from their local computer: it requires to add their RSA KEY to the Studio account or a dedicated account (support-team@nuxeo.com)

Those changes will avoid any SSH access on prod.