disable_ssl_certificate_validation usage not compliant to documentation

[peppelinux]

https://pysaml2.readthedocs.io/en/latest/howto/config.html?highlight=disable_ssl_certificate_validation#metadata

to get disable_ssl_certificate_validation to work we need to put it in the main SP configuration, using it in a metadata entries will not work

Code Version

current master branch

Expected Behavior

as documentation shown it's necessary to bypass the https certificate validation per entries and not globally for all the metadata mdq/remote endpoints.

[c00kiemon5ter]

I agree this is not correct

[peppelinux]

It's related to
https://github.com/IdentityPython/pysaml2/pull/694/files

I closed it because I assumed that this feature was already implemented but I just checked that the behaviour should be different.

I don't want to reopen that PR, I think to do a new one with less code as possibile, leaving the global parameter optionally usable as it is.