[py3] Revert change from long -> int

Use `long` for py2, and `int` for py3. Otherwise we will get an
integer overflow for py2 32bit.

Author: MrSaints

jaeger_client/thrift.py

@@ -19,6 +19,7 @@
 # THE SOFTWARE.
 
 from past.builtins import basestring
+import six
 import socket
 import struct
 
@@ -118,7 +119,8 @@ def timestamp_micros(ts):
     :param ts:
     :return:
     """
-    return int(ts * 1000000)
+    long_fn = int if six.PY3 else long
+    return long_fn(ts * 1000000)
 
 
 def make_zipkin_spans(spans):