fix: Set bool as string for bootable and multiattach

Set bool as string for bootable and multiattach query
params.
The cinder client only accept truth value for api as
query params.

Change-Id: Id26a0233c2ffc2d4165e96cab37c62c77fbefb24

skyline_apiserver/api/v1/extension.py

@@ -592,16 +592,14 @@ async def list_volumes(
         else:
             sort = ",".join(sort_keys)
 
-    # If bootable is false, it is ineffective, due to existed issue of community
-    # https://bugs.launchpad.net/python-cinderclient/+bug/1925737
     search_opts = {
         "with_count": True,
         "name": name,
-        "multiattach": multiattach,
+        "multiattach": str(multiattach) if multiattach is not None else multiattach,
         "status": status,
         "all_tenants": all_projects,
         "project_id": project_id,
-        "bootable": bootable,
+        "bootable": str(bootable) if bootable is not None else bootable,
         "id": uuid,
     }
     # if not is_admin, cinder will ignore the all_projects query param.