go/printer: changed max. number of newlines from 3 to 2

manual changes in src/pkg/go/printer, src/cmd/gofix/signal_test.go
(cd src/cmd/gofix/testdata; gofmt -w *.in *.out)
(cd src/pkg/go/printer; gotest -update)
gofmt -w misc src

runs all tests

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4715041

handshake_server_test.go

@@ -106,7 +106,6 @@ func TestClose(t *testing.T) {
 	}
 }
 
-
 func testServerScript(t *testing.T, name string, serverScript [][]byte, config *Config) {
 	c, s := net.Pipe()
 	srv := Server(s, config)

key_agreement.go

@@ -78,7 +78,6 @@ func (ka rsaKeyAgreement) generateClientKeyExchange(config *Config, clientHello
 	return preMasterSecret, ckx, nil
 }
 
-
 // md5SHA1Hash implements TLS 1.0's hybrid hash function which consists of the
 // concatenation of an MD5 and SHA1 hash.
 func md5SHA1Hash(slices ...[]byte) []byte {