Add time delay after launching eventserver before executing test suite

tests.py

@@ -4,6 +4,7 @@
 import argparse
 import xmlrunner
 import logging
+import time
 import pio_tests.globals as globals
 from utils import srun_bg
 from pio_tests.integration import TestContext
@@ -64,6 +65,7 @@ def get_tests(test_context):
  # Actual tests execution
  event_server_process = srun_bg('pio eventserver --ip {} --port {}'
  .format(test_context.es_ip, test_context.es_port))
+ time.sleep(5)
  result = xmlrunner.XMLTestRunner(verbosity=2, output='test-reports').run(unittest.TestSuite(tests))
  event_server_process.kill()