Minor fixes in ActivateSession service
Minor fixes in ActivateSession services detected using UACTT tests:
- Session shall not be closed in ActivateSession service in following cases:
- valid session used by another Secure Channel than the associated one: the SC is faulty in this case but not the session
- wrong parameters provided to the services: the session will be closed on timeout if valid parameters never provided
- The user token shall be rejected with Bad IdentityTokenInvalid when the token is not valid for the current configuration instead of Bad IdentityTokenRejected. Even if its format is correct and could be valid for another configuration