CI: switched back to nohup in before_script block, made executable

.travis.yml

@@ -9,10 +9,11 @@ before_install:
   - pip3 install -r ./ci/requirements_dev.txt
 install:
   - pip3 install -r requirements.txt
-before_script:
+after_install:
   - bash ./ci/check_code.sh
+before_script:
+  - nohup python3 ./ci/ci_test_prepare.py &
 script:
-  - python3 ./ci/ci_test_prepare.py &
   - python3 ./ci/ci_test.py
 after_script:
-  - bash ./ci/ci_commit.shs
+  - bash ./ci/ci_commit.sh

ci/ci_test.py

@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 import os
 import sys
 import glob

ci/ci_test_prepare.py

@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 import os
 import sys
 import glob