The configuration option 'valid_for' is not used

[lorenzogil]

In the documentation (/doc/howto/config.rst) it says:

valid_for

How many hours this configuration is expected to be accurate.:

"valid_for": 24

This of course is only used by make_metadata.py. The server will not stop working when this amount of time has elapsed :-).

But in the make_metadata.py script this parameter is not read from the config file. It is read from a command line option.

I suggest we:

A) Remove that option from the documentation or
B) Use the option from the config file as a default value overridable by the command line switch. Or even better, remove the 'valid_for' parameter from the saml2.metadata.entity_descriptor function and read it from the config parameter that it is already receiving.