Propagation frontend url from test node to the runTestSuite script

Now the test node sends a  `--frontend_url` parameter to the test suite, which an IPv4-enabled URL to the test node's backend. This is required to run remote tests on environments without IPv6 connectivity. 

Also the SlapOSController now waits 20 seconds instead of 10 seconds for the SlapOS proxy web server to start answering requests. On slower machines 10 seconds weren't being enough.

@Tyagov, please review.

/reviewed-on nexedi/erp5!189

erp5/util/testnode/SlapOSControler.py

@@ -280,7 +280,7 @@ class SlapOSControler(object):
     process_manager.process_pid_set.add(proxy.pid)
     # XXX: dirty, giving some time for proxy to being able to accept
     # connections
-    time.sleep(10)
+    time.sleep(20)
     try:
       slap = slapos.slap.slap()
       self.slap = slap

erp5/util/testnode/UnitTestRunner.py

@@ -147,7 +147,8 @@ class UnitTestRunner():
                            '--revision', node_test_suite.revision,
                            '--test_suite_title', node_test_suite.test_suite_title,
                            '--node_quantity', config['node_quantity'],
-                           '--master_url', portal_url])
+                           '--master_url', portal_url,
+                           '--frontend_url', slapos_controler.config['frontend_url']])
     firefox_bin_list = glob.glob("%s/soft/*/parts/firefox/firefox-slapos" % \
         config["slapos_directory"])
     if len(firefox_bin_list):

erp5/util/testnode/__init__.py

@@ -92,6 +92,7 @@ def main(*args):
   CONFIG['httpd_url'] = 'https://[%s]:%s' % (CONFIG['httpd_ip'],
         CONFIG['httpd_port'])
   CONFIG['system_temp_folder'] = "/tmp"
+  CONFIG['frontend_url'] = config.get('testnode', 'frontend_url')
 
   # generate vcs_repository_list
   if 'bot_environment' in config.sections():

erp5/util/testnode/testnode.py

@@ -133,7 +133,6 @@ class TestNode(object):
                                     node_test_suite.reference)
           software_config_path = os.path.relpath(software_config_path, from_path)
 
-
         profile_content_list.append("""
 [buildout]
 extends = %(software_config_path)s

erp5/util/testsuite/__init__.py

@@ -289,6 +289,9 @@ def runTestSuite():
   parser.add_argument('--master_url',
                       help='The Url of Master controling many suites',
                       default=None)
+  parser.add_argument('--frontend_url',
+                      help='The url of the frontend of this test node',
+                      default=None)
   parser.add_argument('--source_code_path_list',
                       help='List of Eggs folders to test, splited by commam',
                       default='.')