p2p: change ping ticker to timer (#15071)

Using a Timer over Ticker seems to be a lot better, though I cannot fully
account for why that it behaves so (since Ticker should be more bursty, but not
necessarily more active over time, but that may depend on how long window it
uses to decide on when to tick next)

p2p/peer.go

@@ -190,7 +190,7 @@ loop:
 }
 
 func (p *Peer) pingLoop() {
-	ping := time.NewTicker(pingInterval)
+	ping := time.NewTimer(pingInterval)
 	defer p.wg.Done()
 	defer ping.Stop()
 	for {
@@ -200,6 +200,7 @@ func (p *Peer) pingLoop() {
 				p.protoErr <- err
 				return
 			}
+			ping.Reset(pingInterval)
 		case <-p.closed:
 			return
 		}