The native pb engine doesn't accept types other than int or long:

...
  File "/root/src/criu/pycriu/images/pb2dict.py", line 264, in dict2pb
    pb_val.append(_dict2pb_cast(field, v))
  File "/usr/lib/python2.7/site-packages/google/protobuf/internal/containers.py", line 111, in append
    self._type_checker.CheckValue(value)
  File "/usr/lib/python2.7/site-packages/google/protobuf/internal/type_checkers.py", line 104, in CheckValue
    raise TypeError(message)
TypeError: 1.1258999068426252e+16 has type <type 'float'>, but expected one of: (<type 'int'>, <type 'long'>)

In particular, this is seen when encoding back so_filter field from
inetsk image.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Ruslan Kuprieiev <kupruser@gmail.com>