NXP-14595 Initial work on SAML 2.0 authentication plugin
NXP-14595 Added test for AuthnRequest and support RelayState in the auth request.

Also added initial OneLogin sample (not working yet)
NXP-14595 Initial work on Single Logout Profile

Refactored SAML Profiles to extract interfaces.
Added AssertionConsumerServiceURL and Issuer to SSO.
NXP-14595 SP initiated Single Logout working

Initial work on IdP initiated single logout.
Added custom OneLogin metadata to add support for SLO.
NXP-14595: docs, cleanup and sample auth plugin
Merge pull request #7 from nelsonsilva/feature-NXP-14595-SAML2

NXP-14595: SAML V2 Plugin