common: Incorrect definition of Serializable class

CID 1222562 (#1 of 1): Se: Incorrect definition of Serializable class
(FB.SE_BAD_FIELD)1. defect: Class
org.ovirt.engine.core.common.action.LoginUserParameters defines
non-transient non-serializable instance field authInfo

Change-Id: I0db42bc8f1c1173c2bcdf4791c5311b5e65601f9
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>