Collapse PeerConfig into P2PConfig

As both configs are concerned with the p2p packaage and PeerConfig is
only used inside of the package there is no good reason to keep the
couple of fields separate, therefore it is collapsed into the more
general P2PConifg. This is a stepping stone towards a setup where the
components inside of p2p do not have any knowledge about the config.

follow-up to #1325

config/config.go

@@ -5,6 +5,15 @@ import (
 	"os"
 	"path/filepath"
 	"time"
+
+	tmconn "github.com/tendermint/tendermint/p2p/conn"
+)
+
+const (
+	// FuzzModeDrop is a mode in which we randomly drop reads/writes, connections or sleep
+	FuzzModeDrop = iota
+	// FuzzModeDelay is a mode in which we randomly sleep
+	FuzzModeDelay
 )
 
 // NOTE: Most of the structs & relevant comments + the
@@ -287,11 +296,24 @@ type P2PConfig struct {
 	// Does not work if the peer-exchange reactor is disabled.
 	SeedMode bool `mapstructure:"seed_mode"`
 
-	// Comma separated list of peer IDs to keep private (will not be gossiped to other peers)
+	// Comma separated list of peer IDs to keep private (will not be gossiped to
+	// other peers)
 	PrivatePeerIDs string `mapstructure:"private_peer_ids"`
 
 	// Toggle to disable guard against peers connecting from the same ip.
 	AllowDuplicateIP bool `mapstructure:"allow_duplicate_ip"`
+
+	// Peer connection configuration.
+	HandshakeTimeout time.Duration      `mapstructure:"handshake_timeout"`
+	DialTimeout      time.Duration      `mapstructure:"dial_timeout"`
+	MConfig          tmconn.MConnConfig `mapstructure:"connection"`
+
+	// Testing params.
+	// Force dial to fail
+	TestDialFail bool `mapstructure:"test_dial_fail"`
+	// FUzz connection
+	TestFuzz       bool            `mapstructure:"test_fuzz"`
+	TestFuzzConfig *FuzzConnConfig `mapstructure:"test_fuzz_config"`
 }
 
 // DefaultP2PConfig returns a default configuration for the peer-to-peer layer
@@ -308,6 +330,12 @@ func DefaultP2PConfig() *P2PConfig {
 		PexReactor:              true,
 		SeedMode:                false,
 		AllowDuplicateIP:        true, // so non-breaking yet
+		HandshakeTimeout:        20 * time.Second,
+		DialTimeout:             3 * time.Second,
+		MConfig:                 tmconn.DefaultMConnConfig(),
+		TestDialFail:            false,
+		TestFuzz:                false,
+		TestFuzzConfig:          DefaultFuzzConnConfig(),
 	}
 }
 
@@ -326,6 +354,26 @@ func (cfg *P2PConfig) AddrBookFile() string {
 	return rootify(cfg.AddrBook, cfg.RootDir)
 }
 
+// FuzzConnConfig is a FuzzedConnection configuration.
+type FuzzConnConfig struct {
+	Mode         int
+	MaxDelay     time.Duration
+	ProbDropRW   float64
+	ProbDropConn float64
+	ProbSleep    float64
+}
+
+// DefaultFuzzConnConfig returns the default config.
+func DefaultFuzzConnConfig() *FuzzConnConfig {
+	return &FuzzConnConfig{
+		Mode:         FuzzModeDrop,
+		MaxDelay:     3 * time.Second,
+		ProbDropRW:   0.2,
+		ProbDropConn: 0.00,
+		ProbSleep:    0.00,
+	}
+}
+
 //-----------------------------------------------------------------------------
 // MempoolConfig