erp5.util: fix a bug preventing the test suite to start with recent slapos

Commit a01da084 failed to fix the
handling of parameters in the dealShebang function and the bug is now
triggered since slapos@f834a06f:

$ PATH=...  SLAPOS_TEST_LOG_DIRECTORY=... SLAPOS_TEST_SHARED_PART_LIST=... /bin/sh '-e
' /srv/slapgrid/slappart0/t/.../i/0/bin/runTestSuite ...
runTestSuite: /bin/sh: 0: Illegal option -

erp5/util/testnode/UnitTestRunner.py

@@ -38,7 +38,7 @@ from slapos.grid.utils import md5digest
 def dealShebang(run_test_suite_path):
   with open(run_test_suite_path) as f:
     if f.read(2) == '#!':
-      return f.readline().split(None, 1)
+      return f.readline().rstrip().split(None, 1)
   return []
 
 class UnitTestRunner(object):