Backporting to stable (#6060)

* --reseal-on-uncle (#5940)

* --reseal-on-uncle

* Optimized uncle check

* Additional uncle check

* Updated comment

* v1.6.9

* CLI: Export error message and less verbose peer counter. (#5870)

* Removed numbed of active connections from informant

* Print error message when fatdb is required

* Remove peers from UI

rpc/src/v1/tests/eth.rs

@@ -57,6 +57,7 @@ fn miner_service(spec: &Spec, accounts: Arc<AccountProvider>) -> Arc<Miner> {
 			force_sealing: true,
 			reseal_on_external_tx: true,
 			reseal_on_own_tx: true,
+			reseal_on_uncle: false,
 			tx_queue_size: 1024,
 			tx_gas_limit: !U256::zero(),
 			tx_queue_strategy: PrioritizationStrategy::GasPriceOnly,