Fix Centos8 build (#126)

* Increase server wait

* Use standard shebang for python scripts

src/auth/reference_modules/example.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/python3
 import json
 import io
 

src/auth/reference_modules/ldap.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/python3
 import json
 import io
 import ssl

tests/integration/ldap/runner.py

@@ -73,7 +73,7 @@ class Memgraph:
         virtualenv_bin = os.path.join(SCRIPT_DIR, "ve3", "bin", "python3")
         with open(script_file) as fin:
             data = fin.read()
-            data = data.replace("/usr/bin/env python3", virtualenv_bin)
+            data = data.replace("/usr/bin/python3", virtualenv_bin)
             data = data.replace("/etc/memgraph/auth/ldap.yaml",
                                 self._auth_config)
             with open(self._auth_module, "w") as fout:

tests/integration/telemetry/runner.py

@@ -45,7 +45,7 @@ def execute_test(**kwargs):
     server = None
     if start_server:
         server = subprocess.Popen(list(map(str, server_args)))
-        time.sleep(0.1)
+        time.sleep(0.4)
         assert server.poll() is None, "Server process died prematurely!"
 
     try: