Add a new recovery_pg_switch setting to mix all PGs during recovery

src/osd_peering.cpp

@@ -32,7 +32,16 @@ void osd_t::handle_peers()
                     if (p.second.state & PG_HAS_UNCLEAN)
                         peering_state = peering_state | OSD_FLUSHING_PGS;
                     else if (p.second.state & (PG_HAS_DEGRADED | PG_HAS_MISPLACED))
+                    {
                         peering_state = peering_state | OSD_RECOVERING;
+                        if (p.second.state & PG_HAS_DEGRADED)
+                        {
+                            // Restart recovery from degraded objects
+                            recovery_last_degraded = true;
+                            recovery_last_pg = {};
+                            recovery_last_oid = {};
+                        }
+                    }
                     ringloop->wakeup();
                     return;
                 }