core (plugins): added missing contants + use of new constants in PLUGIN_INFO

src/plugins/plugin_misc_welcome.py

@@ -25,12 +25,12 @@ from sat.tools import xml_tools
 
 
 PLUGIN_INFO = {
-    "name": "Welcome",
-    "import_name": "WELCOME",
-    "type": C.PLUG_TYPE_MISC,
-    "main": "Welcome",
-    "handler": "no",
-    "description": _("""Plugin which manage welcome message and things to to on first connection.""")
+    C.PI_NAME: "Welcome",
+    C.PI_IMPORT_NAME: "WELCOME",
+    C.PI_TYPE: C.PLUG_TYPE_MISC,
+    C.PI_MAIN: "Welcome",
+    C.PI_HANDLER: "no",
+    C.PI_DESCRIPTION: _("""Plugin which manage welcome message and things to to on first connection.""")
 }