row based access control does not work with openid users

[aeberhart]

in org.dashjoin.service.ACLContainerRequestFilter.tenantValue(SecurityContext, Table), we use principal.getName():

  v = sc.getUserPrincipal().getName();

this needs to be harmonized with the logic in updateProfileFromJWT

[aeberhart]

Fix

• set local users' email to username@localhost
• change tenantValue implementation to use email instead of name
• change documentation to include email in example