The test grub_cmd_set_date is unreliable

[Leo Famulari]

In GNU Guix, we've found the test grub_cmd_set_date to be unreliable.

I haven't measured how often it fails, but it's often enough that we've
received several reports of it appearing to fail non-deterministically:

http://bugs.gnu.org/26936

We will probably disable the test for now, but it would be good to learn
what's going wrong.

Please let me know what sort of information I can provide to assist with
debugging.

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