DRY-up recording the outcome of SMS sending

This reduces the code to copy when we add a new provider. I don't
think we need to log the URL or status code each time:

- The URL is always the same.
- A "200" status code is implicit in "success".
- Other status codes will be reported as exceptions.

Removing these specific elements means "record_outcome" is generic
and can be de-duplicated in the base class.

app/clients/sms/__init__.py

@@ -18,6 +18,19 @@ class SmsClient(Client):
     Base Sms client for sending smss.
     '''
 
+    def record_outcome(self, success):
+        log_message = "Provider request for {} {}".format(
+            self.name,
+            "succeeded" if success else "failed",
+        )
+
+        if success:
+            self.current_app.logger.info(log_message)
+            self.statsd_client.incr(f"clients.{self.name}.success")
+        else:
+            self.statsd_client.incr(f"clients.{self.name}.error")
+            self.current_app.logger.warning(log_message)
+
     def send_sms(self, *args, **kwargs):
         raise NotImplementedError('TODO Need to implement.')