KNL-1029 Fixed the blocking of tables. We will make a low security version of the policy file for allowing embeds with unsafe/unknown but that won't be the default

git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@121905 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1015 moved names of policy files and updated to allow easy low and high swapping by config value

git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@121906 66ffb92e-73f9-0310-93c1-f5514f145a0a