Tiny lint+format fix in gossip leaderElection tests

- Missing s in %s message formatting
- golint complained about a variable name

Change-Id: I933059d6200736c069d4cce8940cb5b09e3c098d
Signed-off-by: Yacov Manevich <yacovm@il.ibm.com>

Author: yacovm

gossip/election/adapter_test.go

@@ -117,8 +117,8 @@ func TestAdapterImpl_Gossip(t *testing.T) {
 
 	channels := make(map[string]<-chan Msg)
 
-	for peerId, adapter := range adapters {
-		channels[peerId] = adapter.Accept()
+	for peerID, adapter := range adapters {
+		channels[peerID] = adapter.Accept()
 	}
 
 	sender := adapters[fmt.Sprintf("Peer%d", 0)]

gossip/election/election_test.go

@@ -335,7 +335,7 @@ func TestPartition(t *testing.T) {
 	assert.Equal(t, "p0", leaders[0])
 	for _, p := range peers {
 		if p.id == leaders[0] {
-			assert.True(t, p.isLeaderFromCallback, "Leadership callback result is wrong for %", p.id)
+			assert.True(t, p.isLeaderFromCallback, "Leadership callback result is wrong for %s", p.id)
 		} else {
 			assert.False(t, p.isLeaderFromCallback, "Leadership callback result is wrong for %s", p.id)
 			assert.True(t, p.callbackInvoked, "Leadership callback wasn't invoked for %s", p.id)