Don't create the container in the starting method

This way, once the container is created, even if slapcontainer
fail to start it ; slapcontainer_conf will be written.

slapos/container/prepare.py

@@ -26,8 +26,10 @@ def main(sr_directory, partition_list):
                 lock.acquire(timeout=0)
                 slapcontainer_conf = ConfigParser.ConfigParser()
                 slapcontainer_conf.read(slapcontainer_filename)
+                try:
 
-                requested_status = slapcontainer_conf.get('requested', 'status')
+                    requested_status = slapcontainer_conf.get('requested',
+                                                              'status')
 
                     if not slapcontainer_conf.has_section('current'):
                         slapcontainer_conf.add_section('current')
@@ -37,12 +39,15 @@ def main(sr_directory, partition_list):
                         slapcontainer_conf.set('current', 'status', 'stopped')
 
                     if requested_status == 'started':
+                        if slapcontainer_conf.get('current', 'created') == 'no':
+                            create(sr_directory, partition_path, slapcontainer_conf)
+                        slapcontainer_conf.set('current', 'created', 'yes')
                         start(sr_directory, partition_path,
                               slapcontainer_conf)
                     else:
                         stop(sr_directory, partition_path,
                              slapcontainer_conf)
-
+                finally:
                     with open(slapcontainer_filename, 'w') as slapcontainer_fp:
                         slapcontainer_conf.write(slapcontainer_fp)
             except lockfile.LockTimeout:
@@ -54,11 +59,6 @@ def main(sr_directory, partition_list):
 
 
 def start(sr_directory, partition_path, conf):
-    if conf.get('current', 'created') == 'no':
-        create(sr_directory, partition_path, conf)
-
-    conf.set('current', 'created', 'yes')
-
     lxc_start = os.path.join(sr_directory,
                              'parts/lxc/bin/lxc-start')
     config_filename = os.path.join(partition_path, 'config')