Fix Security randomwalk module

[DomGarguilo]

Fixes #219 and #301

This PR adds the following:

• captures and stores the root auth so when a part of the module is expected to fail, we can elevate permissions to do privileged actions when needed
• added timestamps for all permissions in WalkingSecurity so we can use the ambiguous check helper method for all cases
• added stronger checks to the bulk import cases and properly handle transient errors
• added the GET_SUMMARIES case to TableOp.java so we can run the module without getting a not implemented exception