ONC: add support for non-utf-8 SSIDs

chromeos/test/data/network/invalid_settings_with_repairs.json

 {
     "duplicate-network-guid": {
           "NetworkConfigurations": [
              {
                "GUID": "1",
                 "Type": "WiFi",
                 "Name": "My WiFi Network",
                 "WiFi": {
                   "Passphrase": "dummy",
                   "SSID": "dummySSID",
@@ skipping 140 matching lines @@
     },
     "network-state-field": {
         "GUID": "guid",
         "Type": "Ethernet",
         "Name": "name",
         "Ethernet": {
             "Authentication": "None"
         },
         "ConnectionState": "NotConnected"
     },
+    "network-wifi-invalid-hexssid": {
+        "GUID": "guid",
+        "Type": "WiFi",
+        "Name": "name",
+        "WiFi": {
+            "Passphrase": "some passphrase",
+            "HexSSID": "notvalid",

[pneubeck (no reviews), 2014/11/26 10:15:34]

nit: notvalid -> invalidhex

[cschuet (SLOW), 2014/11/27 11:03:58]

Done.

+            "Security": "WPA-PSK"
+        }
+    },
+    "network-wifi-ssid-and-hexssid-inconsistent": {
+        "GUID": "guid",
+        "Type": "WiFi",
+        "Name": "name",
+        "WiFi": {
+            "Passphrase": "some passphrase",
+            "SSID": "ssid",
+            "HexSSID": "FFFFFF",
+            "Security": "WPA-PSK"
+        }
+    },
     "network-unknown-value": {
         "GUID": "guid",
         "Type": "LTE",
         "Name": "name",
         "Ethernet": {
             "Authentication": "None"
         }
     },
     "network-value-out-of-range": {
         "GUID": "guid",
@@ skipping 289 matching lines @@
             "SSID": "ssid-wpa",
             "UnknownField1": "Value1",
             "Security": "WPA-PSK" }
         }
       ],
       "Certificates": [],
       "Type": "UnencryptedConfiguration",
       "UnknownField3": [],
     }
 }