Swap all 'crypto/rand' rng in tests with 'math/rand'

test/backpressure/backpressure_test.go

 package backpressure_tests
 
 import (
-	crand "crypto/rand"
 	"io"
 	"math/rand"
 	"testing"
@@ -15,6 +14,7 @@ import (
 	eventlog "github.com/ipfs/go-ipfs/thirdparty/eventlog"
 
 	context "github.com/ipfs/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
+	u "github.com/ipfs/go-ipfs/util"
 )
 
 var log = eventlog.Logger("backpressure")
@@ -236,7 +236,7 @@ func TestStBackpressureStreamWrite(t *testing.T) {
 
 		// ready a buffer of random data
 		buf := make([]byte, 65536)
-		crand.Read(buf)
+		u.NewTimeSeededRand().Read(buf)
 
 		for {
 			// send a randomly sized subchunk

test/reconnects/reconnect_test.go

 package reconnect
 
 import (
-	crand "crypto/rand"
 	"io"
 	"math/rand"
 	"sync"
@@ -14,6 +13,7 @@ import (
 	protocol "github.com/ipfs/go-ipfs/p2p/protocol"
 	testutil "github.com/ipfs/go-ipfs/p2p/test/util"
 	eventlog "github.com/ipfs/go-ipfs/thirdparty/eventlog"
+	u "github.com/ipfs/go-ipfs/util"
 
 	ps "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-peerstream"
 	context "github.com/ipfs/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
@@ -66,7 +66,7 @@ func newSender() (chan sendChans, func(s inet.Stream)) {
 
 		buf := make([]byte, 65536)
 		buf2 := make([]byte, 65536)
-		crand.Read(buf)
+		u.NewTimeSeededRand().Read(buf)
 
 		for {
 			select {