deploy: show HTTP errors when virustotal error fails.

Otherwise, this was posting mystery JSON parsing errors because it was
trying to parse the HTTP error page as JSON.  This also moves the
virustotal API key to post data so it is not printed out in the stacktrace.

fdroidserver/server.py

@@ -501,14 +501,14 @@ def upload_to_virustotal(repo_section, vt_apikey):
                 headers = {
                     "User-Agent": "F-Droid"
                 }
-                params = {
+                data = {
                     'apikey': vt_apikey,
                     'resource': package['hash'],
                 }
                 needs_file_upload = False
                 while True:
                     r = requests.post('https://www.virustotal.com/vtapi/v2/file/report',
-                                      params=params, headers=headers)
+                                      data=data, headers=headers)
                     if r.status_code == 200:
                         response = r.json()
                         if response['response_code'] == 0:
@@ -535,7 +535,10 @@ def upload_to_virustotal(repo_section, vt_apikey):
                         'file': (filename, open(repofilename, 'rb'))
                     }
                     r = requests.post('https://www.virustotal.com/vtapi/v2/file/scan',
-                                      params=params, headers=headers, files=files)
+                                      data=data, headers=headers, files=files)
+                    logging.debug('If this upload fails, try manually uploading here:\n'
+                                  + 'https://www.virustotal.com/')
+                    r.raise_for_status()
                     response = r.json()
 
                     logging.info(response['verbose_msg'] + " " + response['permalink'])