test: Don't use "-nographic".
test: Don't use "-nographic".

The intended effect of "-nographic" was to put the serial console of
the VM into the terminal used to run vm-run, but that doesn't work
without also passing "console=ttyS0" to the kernel, which we can't do
anymore without the "-kernel"/"-append" options.

Thus, when run by vm-run, we let qemu do its default, which is to open
a window with the VGA graphics.  When run for a test, we use "-display
none" to avoid that.

Closes #2287
Reviewed-by: Marius Vollmer <bb11c6e942c5cc765df5f04da146b3198127a7a3@redhat.com>

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