Fix of error handling in contrail backup

In cassandra-backup-client-runner-call.sh rsync command redirect to
log file only stdout and all error messages aren't caught by error
handling code.
Updating run_tests.sh

Closes-Bug: PROD-35981
Change-Id: Idd8a069d81c7e110c1cd988e42d7148c0dd5842a
diff --git a/tests/test-requirements.txt b/tests/test-requirements.txt
new file mode 100644
index 0000000..bc7dc7f
--- /dev/null
+++ b/tests/test-requirements.txt
@@ -0,0 +1,4 @@
+jsonschema
+reno
+setuptools<45.0.0
+msgpack<1.0.0