test-runner.py: change shebang to python3

In commit 6e72a5b python scripts which
work with python2 and python3 changed the shebang from /usr/bin/python
to /usr/bin/python3. This gets adapted by the build-system on systems
which don't provide python3.
This commit changes test-runner.py to also use /usr/bin/python3,
enabling the change during buildtime and fixing a minor lintian issue
for those Debian packages, which depend on a specific python version
(python3/python2).

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: loli10K <[email protected]>
Reviewed by: John Kennedy <[email protected]>
Signed-off-by: Stoiko Ivanov <[email protected]>
Closes #8803

tests/test-runner/bin/test-runner.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 #
 # This file and its contents are supplied under the terms of the