Description of problem:
Rebuilding rpm package fails at testing stage

Version-Release number of selected component (if applicable):
rpm-4.16.0-5.fc33 

Steps to Reproduce:
1. rpmbuild -ba rpm.spec


Additional info:

The main problem seems to be the use of the tape drive (/dev/nst0) during the test.
And yes I have a tape drive.


## ---------------------- ##
## Detailed failed tests. ##
## ---------------------- ##

#                             -*- compilation -*-
6. rpmgeneral.at:317: testing rpm2archive ...
./rpmgeneral.at:319:
runroot_other rpm2archive - < "${RPMTEST}"/data/RPMS/hello-2.0-1.x86_64.rpm | tar tz
runroot_other rpm2archive - < "${RPMTEST}"/data/SRPMS/hello-1.0-1.src.rpm | tar tz

--- /dev/null┆  2020-11-26 12:29:32.542914477 +0000
+++ /home/pawel/rpmbuild/BUILD/rpm-4.16.0/tests/rpmtests.dir/at-groups/6/stderr┆2020-11-30 16:50:22.865422023 +0000
@@ -0,0 +1,12 @@
+tar (child): /dev/nst0: Cannot open: No medium found
+tar (child): Error is not recoverable: exiting now
+
+gzip: stdin: unexpected end of file 
+tar: Child returned status 2
+tar: Error is not recoverable: exiting now
+tar (child): /dev/nst0: Cannot open: No medium found
+tar (child): Error is not recoverable: exiting now
+
+gzip: stdin: unexpected end of file 
+tar: Child returned status 2
+tar: Error is not recoverable: exiting now
--- -┆  2020-11-30 16:50:22.870870713 +0000
+++ /home/pawel/rpmbuild/BUILD/rpm-4.16.0/tests/rpmtests.dir/at-groups/6/stdout┆2020-11-30 16:50:22.867422014 +0000
@@ -1,8 +1 @@
-./usr/bin/hello
-./usr/share/doc/hello-2.0/
-./usr/share/doc/hello-2.0/COPYING
-./usr/share/doc/hello-2.0/FAQ
-./usr/share/doc/hello-2.0/README
-./hello-1.0.tar.gz
-./hello.spec
 
./rpmgeneral.at:319: exit code was 2, expected 0
6. rpmgeneral.at:317: 6. rpm2archive (rpmgeneral.at:317): FAILED (rpmgeneral.at:319)