server store invitation answer by lookupkey + refactor background check

client/identity.go

@@ -262,6 +262,7 @@ func (id *Identity) GetRequestJobs() []*RequestsJob {
 		}
 		// add ids to the map
 		for _, peer := range id.Peers {
+			// check if peer inviation is accepted
 			for _, server := range peer.MyPullServers {
 				srvs[server].LookupKeys = append(srvs[server].LookupKeys, peer.MyLookupKp)
 			}