Add device creation to basic nightly test.

Add device creation to basic nightly test.

Ensure we can create devices for use in tests before running the real
tests.  This may in various cases, and may involve machine configuration
rather than a failure in some specific test.
For example, if a test is run with LVM_TEST_DIR=/tmp, selinux is enabled,
and the default security context is set to "<<none>>" for /tmp, all the
tests will fail, unable to create devices, since dmsetup will fail, a
result of machpathcon() returning an error code.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>