Resolve "Too many open files"

application-framework/registration/registration.go

controller/northbound/client/app.go

controller/northbound/client/configurationManagement.go

controller/northbound/client/networkElement.go

controller/northbound/client/plugin.go

controller/northbound/client/pnd.go

controller/northbound/client/rbac.go

controller/northbound/client/sbi.go

controller/northbound/client/submanagement.go

controller/nucleus/databaseNetworkElementStore.go

controller/nucleus/gnmi_transport.go

controller/nucleus/plugin.go

controller/rbac/databaseUserStore.go

controller/topology/nodes/databaseNodeStore.go