The getLastSecurityLogRetrievalTime(), getLastBugReportRequestTime()
and getLastNetworkLogRetrievalTime() methods are meant to be used by
system code. However, there is no harm in allowing the DO to access the
information they return - because it is information about actions that
the DO itself took.
The advantage of opening up these methods to the DO is that we can
CTS-test them.
Bug: 32692748
Test: DevicePolicyManager unit test + CTS test in separate CL
Change-Id: I1470fca2a82b9955f7aed5e8b50220bea8b56fc9
8d76e72251