Sort output for test case to avoid race condition

Not 100% sure where the race condition actually emerges from as both
messages should come from the same process and only after the urlhelper
has finished. But if this is seen in the wild we better fix it...

Related: #3106

tests/rpmgeneral.at

@@ -389,7 +389,7 @@ AT_KEYWORDS([urlhelper])
 RPMDB_INIT
 RPMTEST_CHECK([
 # runroot rpm --define "_urlhelper /not/there" --root /srv/test -qp https://example.com/foo-0.1-1.noarch.rpm
-runroot rpm --define "_urlhelper /not/there" -qp https://www.example.com/foo-1.0-1.x86_64.rpm
+runroot rpm --define "_urlhelper /not/there" -qp https://www.example.com/foo-1.0-1.x86_64.rpm 2> >( sort >&2)
 ],
 [1],
 [],
@@ -402,7 +402,7 @@ AT_SETUP([urlhelper fails])
 AT_KEYWORDS([urlhelper])
 RPMDB_INIT
 RPMTEST_CHECK([
-runroot rpm --define "_urlhelper /bin/false" --root /srv/test -qp https://example.com/foo-0.1-1.noarch.rpm 2> >(sed 's| /.*rpm-tmp.* https| rpm-tmp https|' >&2)
+runroot rpm --define "_urlhelper /bin/false" --root /srv/test -qp https://example.com/foo-0.1-1.noarch.rpm 2> >(sed 's| /.*rpm-tmp.* https| rpm-tmp https|' | sort >&2)
 ],
 [1],
 [],