Backport OPENIDM-11024: NPE can be thrown if the authentication service comes up before the identityService

, service.vendor=ForgeRock AS., service.pid=org.forgerock.openidm.authentication, openidm.router.prefix=/authentication, connectionFactory.target=(service.pid=org.forgerock.openidm.router.internal), _rev=000000001d596b92, component.id=9, _id=org.forgerock.openidm.authentication, service.description=OpenIDM Authentication Service}
May 24, 2018 9:10:19 PM org.forgerock.openidm.config.logging.LogServiceTracker logEntry
SEVERE: Bundle: org.forgerock.openidm.authnfilter [29] [org.forgerock.openidm.authentication(9)] The activate method has thrown an exception
java.lang.NullPointerException
       at org.forgerock.openidm.auth.AuthenticationService.lambda$new$5(AuthenticationService.java:315)
       at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
       at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
       at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
       at java.util.stream.IntPipeline$4$1.accept(IntPipeline.java:250)