gossip: remove unnecessary option

Co-authored-by: Loong <loongy@users.noreply.github.com>

gossip/gossip.go

@@ -260,7 +260,7 @@ func (g *Gossiper) sendToSubnet(subnet id.Hash, msg wire.Message) {
 	if subnet == DefaultSubnet {
 		// If the default subnet hash is provided, return a random subset of all
 		// known signatories.
-		addrs := g.dht.Addrs(g.opts.MaxRandomSignatories)
+		addrs := g.dht.Addrs(g.opts.Alpha)
 		subnetSignatories = make([]id.Signatory, 0, len(addrs))
 		for _, addr := range addrs {
 			sig, err := addr.Signatory()

gossip/opt.go

@@ -10,7 +10,6 @@ var (
 	DefaultAlpha                = 10
 	DefaultBias                 = 0.25
 	DefaultTimeout              = 5 * time.Second
-	DefaultMaxRandomSignatories = 10
 )
 
 type Options struct {
@@ -19,7 +18,6 @@ type Options struct {
 	Alpha                int
 	Bias                 float64
 	Timeout              time.Duration
-	MaxRandomSignatories int
 }
 
 func DefaultOptions() Options {
@@ -31,7 +29,6 @@ func DefaultOptions() Options {
 		Alpha:                DefaultAlpha,
 		Bias:                 DefaultBias,
 		Timeout:              DefaultTimeout,
-		MaxRandomSignatories: DefaultMaxRandomSignatories,
 	}
 }
 
@@ -54,11 +51,3 @@ func (opts Options) WithTimeout(timeout time.Duration) Options {
 	opts.Timeout = timeout
 	return opts
 }
-
-// WithMaxRandomSignatories returns new Options with the given maximum random
-// signatories. This is the maximum number of random signatories that will be
-// queried/gossiped to when using the DefaultHash.
-func (opts Options) WithMaxRandomSignatories(maxRandomSignatories int) Options {
-	opts.MaxRandomSignatories = maxRandomSignatories
-	return opts
-}