Added a first init_db command in scripts/admin

scripts/admin.py

@@ -2,6 +2,7 @@
 
 import sys
 import os, os.path
+from plugins.mongodb_datasource.migration_handler import MongoDbMigrationHandler
 
 sys.path.append(os.path.dirname(os.getcwd()+'/..'))
 from lodel.settings.settings import Settings as settings
@@ -22,3 +23,7 @@ def refresh_dyncode(model_file, translator, output_filename):
         out_fd.write(dyncode)
     out_fd.close()
 
+def init_db(conn_args):
+    migration_handler = MongoDbMigrationHandler(conn_args=conn_args)
+    migration_handler._install_collections()
+    migration_handler.database.close()