go.crypto/ssh/test: move some variables into common os source file to fix windows build

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/6944048
diff --git a/ssh/test/keys_test.go b/ssh/test/keys_test.go
index c00162e..c9c1ec8 100644
--- a/ssh/test/keys_test.go
+++ b/ssh/test/keys_test.go
@@ -44,6 +44,82 @@
 #more to follow but still no valid keys`)
 	authWithMissingQuote = []byte(`env="HOME=/home/root,no-port-forwarding ssh-rsa ` + validKey + ` user@host
 env="HOME=/home/root",shared-control ssh-rsa ` + validKey + ` user@host`)
+
+	testClientPrivateKey = `-----BEGIN RSA PRIVATE KEY-----
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+Cy0LzddU4KE8JZ/tlk68+hM5fjLLA0aqSunaql5CKfplwLu8x1hL
+-----END RSA PRIVATE KEY-----
+`
+	keys = map[string]string{
+		"ssh_host_dsa_key": `-----BEGIN DSA PRIVATE KEY-----
+MIIBugIBAAKBgQDe2SIKvZdBp+InawtSXH0NotiMPhm3udyu4hh/E+icMz264kDX
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+2FTBuC9uacqczDlc+0k=
+-----END DSA PRIVATE KEY-----`,
+		"ssh_host_rsa_key": `-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----`,
+		"ssh_host_ecdsa_key": `-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEINGWx0zo6fhJ/0EAfrPzVFyFC9s18lBt3cRoEDhS3ARooAoGCCqGSM49
+AwEHoUQDQgAEi9Hdw6KvZcWxfg2IDhA7UkpDtzzt6ZqJXSsFdLd+Kx4S3Sx4cVO+
+6/ZOXRnPmNAlLUqjShUsUBBngG0u2fqEqA==
+-----END EC PRIVATE KEY-----`,
+		"authorized_keys": `ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDEX/dPu4PmtvgK3La9zioCEDrJyUr6xEIK7Pr+rLgydcqWTU/kt7w7gKjOw4vvzgHfjKl09CWyvgb+y5dCiTk9MxI+erGNhs3pwaoS+EavAbawB7iEqYyTep3YaJK+4RJ4OX7ZlXMAIMrTL+UVrK89t56hCkFYaAgo3VY+z6rb/b3bDBYtE1Y2tS7C3au73aDgeb9psIrSV86ucKBTl5X62FnYiyGd++xCnLB6uLximM5OKXfLzJQNS/QyZyk12g3D8y69Xw1GzCSKX1u1+MQboyf0HJcG2ryUCLHdcDVppApyHx2OLq53hlkQ/yxdflDqCqAE4j+doagSsIfC1T2T user@host`,
+	}
 )
 
 func TestMarshalParsePublicKey(t *testing.T) {
diff --git a/ssh/test/test_unix_test.go b/ssh/test/test_unix_test.go
index 47a03d0..c303881 100644
--- a/ssh/test/test_unix_test.go
+++ b/ssh/test/test_unix_test.go
@@ -30,8 +30,7 @@
 	"code.google.com/p/go.crypto/ssh"
 )
 
-const (
-	sshd_config = `
+const sshd_config = `
 Protocol 2
 HostKey {{.Dir}}/ssh_host_rsa_key
 HostKey {{.Dir}}/ssh_host_dsa_key
@@ -52,83 +51,6 @@
 RhostsRSAAuthentication no
 HostbasedAuthentication no
 `
-	testClientPrivateKey = `-----BEGIN RSA PRIVATE KEY-----
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-Cy0LzddU4KE8JZ/tlk68+hM5fjLLA0aqSunaql5CKfplwLu8x1hL
------END RSA PRIVATE KEY-----
-`
-)
-
-var keys = map[string]string{
-	"ssh_host_dsa_key": `-----BEGIN DSA PRIVATE KEY-----
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------END DSA PRIVATE KEY-----`,
-	"ssh_host_rsa_key": `-----BEGIN RSA PRIVATE KEY-----
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-9l0lNikMRGAx3eXudKXEtbGt3/cUzPVaQUHy5LiBxkxnFxgaJPXs
------END RSA PRIVATE KEY-----`,
-	"ssh_host_ecdsa_key": `-----BEGIN EC PRIVATE KEY-----
-MHcCAQEEINGWx0zo6fhJ/0EAfrPzVFyFC9s18lBt3cRoEDhS3ARooAoGCCqGSM49
-AwEHoUQDQgAEi9Hdw6KvZcWxfg2IDhA7UkpDtzzt6ZqJXSsFdLd+Kx4S3Sx4cVO+
-6/ZOXRnPmNAlLUqjShUsUBBngG0u2fqEqA==
------END EC PRIVATE KEY-----`,
-	"authorized_keys": `ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDEX/dPu4PmtvgK3La9zioCEDrJyUr6xEIK7Pr+rLgydcqWTU/kt7w7gKjOw4vvzgHfjKl09CWyvgb+y5dCiTk9MxI+erGNhs3pwaoS+EavAbawB7iEqYyTep3YaJK+4RJ4OX7ZlXMAIMrTL+UVrK89t56hCkFYaAgo3VY+z6rb/b3bDBYtE1Y2tS7C3au73aDgeb9psIrSV86ucKBTl5X62FnYiyGd++xCnLB6uLximM5OKXfLzJQNS/QyZyk12g3D8y69Xw1GzCSKX1u1+MQboyf0HJcG2ryUCLHdcDVppApyHx2OLq53hlkQ/yxdflDqCqAE4j+doagSsIfC1T2T user@host`,
-}
 
 var (
 	configTmpl template.Template