Use parter api for account creation

Author: albin-mullvad

android/test/e2e/src/main/kotlin/net/mullvad/mullvadvpn/test/e2e/misc/AccountTestRule.kt

@@ -19,7 +19,7 @@ class AccountTestRule : BeforeEachCallback {
     override fun beforeEach(context: ExtensionContext) {
         InstrumentationRegistry.getArguments().also { bundle ->
             if (partnerAuth != null) {
-                validAccountNumber = client.createAccount()
+                validAccountNumber = client.createAccount(partnerAuth)
                 client.addTimeToAccountUsingPartnerAuth(
                     accountNumber = validAccountNumber,
                     daysToAdd = 1,

android/test/e2e/src/main/kotlin/net/mullvad/mullvadvpn/test/e2e/misc/SimpleMullvadHttpClient.kt

@@ -10,7 +10,6 @@ import com.android.volley.toolbox.JsonObjectRequest
 import com.android.volley.toolbox.RequestFuture
 import com.android.volley.toolbox.StringRequest
 import com.android.volley.toolbox.Volley
-import net.mullvad.mullvadvpn.test.e2e.constant.ACCOUNT_URL
 import net.mullvad.mullvadvpn.test.e2e.constant.AUTH_URL
 import net.mullvad.mullvadvpn.test.e2e.constant.CONN_CHECK_URL
 import net.mullvad.mullvadvpn.test.e2e.constant.DEVICE_LIST_URL
@@ -41,9 +40,13 @@ class SimpleMullvadHttpClient(context: Context) {
         }
     }
 
-    fun createAccount(): String {
-        return sendSimpleSynchronousRequest(method = Request.Method.POST, url = ACCOUNT_URL)!!
-            .getString("number")
+    fun createAccount(partnerAuth: String): String {
+        return sendSimpleSynchronousRequest(
+                method = Request.Method.POST,
+                url = PARTNER_ACCOUNT_URL,
+                authorizationHeader = partnerAuth
+            )!!
+            .getString("id")
     }
 
     fun addTimeToAccountUsingPartnerAuth(