log-gearman-worker: Remove jenkins streaming workaround

We don't need to worry about the file changing under us any more; this
was all pre-zuul, let alone pre-using-swift for logs.  Remove this
workaround.

Change-Id: I5938dcef5550d4c62c8158c5f89ace75ae99aedc

files/log-gearman-worker.py

@@ -317,37 +317,6 @@ class LogRetriever(threading.Thread):
             encoding = 'deflate'
 
         raw_buf = r.read()
-        # Hack to read all of Jenkins console logs as they upload
-        # asynchronously. After each attempt do an exponential backup before
-        # the next request for up to 255 seconds total, if we do not
-        # retrieve the entire file. Short circuit when the end of file string
-        # for console logs, '\n</pre>\n', is read.
-        if (retry and not encoding == 'gzip' and
-            raw_buf[-8:].decode('utf-8') != '\n</pre>\n'):
-            content_len = len(raw_buf)
-            backoff = 1
-            while backoff < 129:
-                # Try for up to 255 seconds to retrieve the complete log file.
-                try:
-                    logging.debug(str(backoff) + " Retrying fetch of: " +
-                                  source_url + "?level=INFO")
-                    logging.debug("Fetching bytes=" + str(content_len) + '-')
-                    req = urllib2.Request(source_url + "?level=INFO")
-                    req.add_header('Range', 'bytes=' + str(content_len) + '-')
-                    r = urllib2.urlopen(req)
-                    raw_buf += r.read()
-                    content_len = len(raw_buf)
-                except urllib2.HTTPError as e:
-                    if e.code == 416:
-                        logging.exception("Index out of range.")
-                    else:
-                        raise
-                finally:
-                    if raw_buf[-8:].decode('utf-8') == '\n</pre>\n':
-                        break
-                    semi_busy_wait(backoff)
-                    backoff += backoff
-
         return encoding, raw_buf