[IMP] core: don't save config when setting admin password

When setting the password in the database manager the config is saved
automatically in a odoorc file.

This can be problematic, especially when testing locally, with
specific options.
Going in the database manager and creating a new database or changing
admin pasword will save all those options.

This commit proposes to only save the admin_passwd when modified.

Part-of: odoo/odoo#82874

odoo/service/db.py

@@ -347,7 +347,7 @@ def exp_rename(old_name, new_name):
 @check_db_management_enabled
 def exp_change_admin_password(new_password):
     odoo.tools.config.set_admin_password(new_password)
-    odoo.tools.config.save()
+    odoo.tools.config.save(['admin_passwd'])
     return True
 
 @check_db_management_enabled

odoo/tools/config.py

@@ -633,11 +633,17 @@ class configmanager(object):
         except ConfigParser.NoSectionError:
             pass
 
-    def save(self):
+    def save(self, keys=None):
         p = ConfigParser.RawConfigParser()
         loglevelnames = dict(zip(self._LOGLEVELS.values(), self._LOGLEVELS))
-        p.add_section('options')
+        rc_exists = os.path.exists(self.rcfile)
+        if rc_exists and keys:
+            p.read([self.rcfile])
+        if not p.has_section('options'):
+            p.add_section('options')
         for opt in sorted(self.options):
+            if keys is not None and opt not in keys:
+                continue
             if opt in ('version', 'language', 'translate_out', 'translate_in', 'overwrite_existing_translations', 'init', 'update'):
                 continue
             if opt in self.blacklist_for_save:
@@ -656,7 +662,6 @@ class configmanager(object):
 
         # try to create the directories and write the file
         try:
-            rc_exists = os.path.exists(self.rcfile)
             if not rc_exists and not os.path.exists(os.path.dirname(self.rcfile)):
                 os.makedirs(os.path.dirname(self.rcfile))
             try: