Add SAML subject identifier attributes to saml2_uri attributemap

[alexstuart]

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Explanation

Two SAML subject identifier attributes have been recently defined in the OASIS SAML V2.0 Subject Identifier Attributes Profile Version 1.0 specifcation and they do not appear in pysaml2's attribute map. This PR is to add the attributes to saml_uri.py following the conventions in that file.

I have tested this change in a pysaml2+SATOSA deployment.

[codecov]

Codecov Report

Merging #607 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #607      +/-   ##
=========================================
- Coverage    65.6%   65.6%   -0.01%     
=========================================
  Files         103     103              
  Lines       25614   25615       +1     
=========================================
- Hits        16805   16804       -1     
- Misses       8809    8811       +2

Impacted Files	Coverage Δ
src/saml2/attributemaps/saml_uri.py	100% <100%> (ø)	⬆️
src/saml2/validate.py	75.29% <0%> (-0.79%)	⬇️

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[c00kiemon5ter]

Thank you; keep in mind that in the future attributemaps will be completely removed.

[peppelinux]

Ho @c00kiemon5ter, why? How Will we do mapping without attrmaps? I saw that it works already whitout attrmaps, Just curiosity

[alexstuart]

Hello @c00kiemon5ter Thanks for merging that PR.

Where can I find out about future plans for pysaml2 attributemaps? I can't see anything relevant in the pysaml2-dev mailing list and I've not found a pysaml2 users mailing list.

Thanks!

[c00kiemon5ter]

Hi again, #549 explains why attributemaps will go away.