JCRVLT-42 Do not allow creation of packages with illegal JCR names

- added checks for valid names when creating or uploading or renaming packages
- filter out packages with illegal names in list

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/commons/filevault/trunk@1582114 13f79535-47bb-0310-9956-ffa450edef68