Fix genetic optimization in master-slave mode

[ajkxyz]

Launch master first:
python3 -m veles -p '' -s --optimize 25 -l 0.0.0.0:10000 veles/samples/genetics.py -
In another console launch slave:
python3 -m veles -p '' -s --optimize 25 -m localhost:10000 veles/samples/genetics.py -

[vmarkovtsev]

Alexey Kazantsev created new patchset 1
for change 134 which triggered build 2256

[ajkxyz]

Sometimes slave gives an error:
Unhandled Error
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/twisted/python/log.py", line 88, in callWithLogger
return callWithContext({"system": lp}, func, _args, *_kw)
File "/usr/lib/python3/dist-packages/twisted/python/log.py", line 73, in callWithContext
return context.call({ILogContext: newCtx}, func, _args, *_kw)
File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 118, in callWithContext
return self.currentContext().callWithContext(ctx, func, _args, *_kw)
File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 81, in callWithContext
return func(args,*kw)
--- ---
File "/usr/lib/python3/dist-packages/twisted/internet/posixbase.py", line 614, in _doReadOrWrite
why = selectable.doRead()
File "/export/home/ajk/Projects/Veles/veles/txzmq/connection.py", line 371, in doRead
message = self._readMultipart(unpickler)
File "/export/home/ajk/Projects/Veles/veles/txzmq/connection.py", line 271, in _readMultipart
obj = pickle.load(obj)
builtins.EOFError: