erp5_bootstrap: add while/try for getConnection

slapos/recipe/erp5_bootstrap/template/erp5_bootstrap.in

@@ -7,6 +7,7 @@ import time
 
 MAX_INSTALLATION_TIME = 60*30
 MAX_TESTING_TIME = 60
+MAX_GETTING_CONNECTION_TIME = 60*5
 
 user = "%(user)s"
 password = "%(password)s"
@@ -21,12 +22,20 @@ header_dict = {'Authorization': 'Basic %%s' %% \
 
 def getConnection():
   print "Getting new connection"
+  start_time = time.time()
+  count = 0
+  while MAX_GETTING_CONNECTION_TIME > time.time()-start_time:
+    try:
+      count = count + 1
       if protocol == 'https':
         return httplib.HTTPSConnection(host)
       elif protocol == 'http':
         return httplib.HTTPConnection(host)
       else:
         raise ValueError("Protocol not implemented")
+      except:
+        print "Getting new connection failed, retry"
+  raise ValueError("Cannot get new connection after %%d try (for %%s s)" %%(count, str(time.time()-start_time)))
 
 def testIfExist(page, unexcepted_content="Site Error"):
   print "Test if %%s exists" %%(page)