[cw-ctl] use default `mkdtemp()` behaviour to store backup file internally
When using `mkdtemp(dir=instbkdir)`, a dedicated system user which hasn't the
permissions to write in /var/lib/cubicweb/instances/$INSTANCE/backup will not
be able to run the db-dump command.
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
# Enable / disable this checker
enable-variables = yes
additional-builtins = _, display_name
[BASIC]
required-attributes=
attr-rgx = (w|[a-z_][a-z0-9_]{2,30})
variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$
argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$
[TYPECHECK]
generated-members=debug,info,notice,warning,error,critical,exception