esx: Fix connection to ESX 5.1

After separating 5.x and 5.1 versions of ESX, we forgot to add 5.1
into the list of allowed connections, so connections to 5.1 fail since
v1.0.0-rc1-5-g1e7cd395
(cherry picked from commit bab7752c)

src/esx/esx_driver.c

@@ -718,6 +718,7 @@ esxConnectToHost(virConnectPtr conn,
             priv->host->productVersion != esxVI_ProductVersion_ESX41 &&
             priv->host->productVersion != esxVI_ProductVersion_ESX4x &&
             priv->host->productVersion != esxVI_ProductVersion_ESX50 &&
+            priv->host->productVersion != esxVI_ProductVersion_ESX51 &&
             priv->host->productVersion != esxVI_ProductVersion_ESX5x) {
             virReportError(VIR_ERR_INTERNAL_ERROR,
                            _("%s is neither an ESX 3.5, 4.x nor 5.x host"),
@@ -847,6 +848,7 @@ esxConnectToVCenter(virConnectPtr conn,
         priv->vCenter->productVersion != esxVI_ProductVersion_VPX41 &&
         priv->vCenter->productVersion != esxVI_ProductVersion_VPX4x &&
         priv->vCenter->productVersion != esxVI_ProductVersion_VPX50 &&
+        priv->vCenter->productVersion != esxVI_ProductVersion_VPX51 &&
         priv->vCenter->productVersion != esxVI_ProductVersion_VPX5x) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("%s is neither a vCenter 2.5, 4.x nor 5.x server"),