configure saml2.0 plugin

sample configuration

jenkins:

securityRealm:

saml:

binding: "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"

displayNameAttributeName: "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name"

emailAttributeName: "Email"

groupsAttributeName: "http://schemas.xmlsoap.org/claims/Group"

idpMetadataConfiguration:

period: 0

url: "https://abc.com"

maximumAuthenticationLifetime: 86400

usernameAttributeName: "NameID"

usernameCaseConversion: "none"