SAML2 configuration

To configure SAML2 for Waldur:

1. Enable SAML2 support in values.yaml: add SAML2 string into waldur.authMethods list
2. Set source directory in waldur.saml2.dir
3. Place necessary files in the directory with the following manner (. is the source directory root):
   • sp.crt -> ./
   • sp.pem -> ./
   • saml2.conf.py -> ./