skip EFSStream tests if ::EncryptFileW fails
skip EFSStream tests if ::EncryptFileW fails

a failure there indicates the machine isn't capable of EFS,
either due to OS restriction (Home editions can't do it), or
bad recovery agent configuration.  in these cases, we can't
test the stream meaningfully, so skip the tests rather than
causing a spurious failure

Change-Id: I9926e6f4d522878f7cdca4770dcd2844761a316a
Reviewed-on: https://gerrit.dechocorp.com/27836
Reviewed-by: Jenkins <49695b0f9c673fd73dab0ff3f84b5ced9302cc6a@mozy.com>
Reviewed-by: Kevin Cai <7771192b74080b0349ce1991a9eaaeec64bf9e00@vmware.com>
Reviewed-by: Andrew Skowronski <96924f7a4dbe24093bb2da18f50a76703cb4a362@mozy.com>

mozy/mordor,mtanski/mordor,ccutrer/mordor,mozy/mordor,mozy/mordor,adfin/mordor,adfin/mordor,adfin/mordor,mtanski/mordor,mtanski/mordor,ccutrer/mordor,ccutrer/mordor