fundingmanager+server: define MaxPendingChans. RejectPush in funding config

This commit makes the funding manager access the MaxPendingChannels and
RejectPush values from the fundingConfig instead of the global config
struct.

Done to avoid sharing state between tests.

fundingmanager.go

@@ -337,6 +337,14 @@ type fundingConfig struct {
 	// due to fees.
 	MinChanSize btcutil.Amount
 
+	// MaxPendingChannels is the maximum number of pending channels we
+	// allow for each peer.
+	MaxPendingChannels int
+
+	// RejectPush is set true if the fundingmanager should reject any
+	// incoming channels having a non-zero push amount.
+	RejectPush bool
+
 	// NotifyOpenChannelEvent informs the ChannelNotifier when channels
 	// transition from pending open to open.
 	NotifyOpenChannelEvent func(wire.OutPoint)
@@ -1012,7 +1020,7 @@ func (f *fundingManager) handleFundingOpen(fmsg *fundingOpenMsg) {
 
 	// TODO(roasbeef): modify to only accept a _single_ pending channel per
 	// block unless white listed
-	if numPending >= cfg.MaxPendingChannels {
+	if numPending >= f.cfg.MaxPendingChannels {
 		f.failFundingFlow(
 			fmsg.peer, fmsg.msg.PendingChannelID,
 			lnwire.ErrMaxPendingChannels,
@@ -1057,7 +1065,7 @@ func (f *fundingManager) handleFundingOpen(fmsg *fundingOpenMsg) {
 
 	// If request specifies non-zero push amount and 'rejectpush' is set,
 	// signal an error.
-	if cfg.RejectPush && msg.PushAmount > 0 {
+	if f.cfg.RejectPush && msg.PushAmount > 0 {
 		f.failFundingFlow(
 			fmsg.peer, fmsg.msg.PendingChannelID,
 			lnwallet.ErrNonZeroPushAmount())