delete chunk buffer for VectorReadInfo after copying into python string

[nikoladze]

This should fix #1400. I added a delete after a chunk buffer is copied into a python string in the conversion function for VectorReadInfo, analogous to what is done here for ChunkInfo:

xrootd/bindings/python/src/Conversions.hh

Lines 248 to 257 in 551521e

	template<> struct PyDict<XrdCl::ChunkInfo>
	{
	static PyObject* Convert( XrdCl::ChunkInfo *chunk )
	{
	PyObject *o = PyBytes_FromStringAndSize( (const char*)chunk->buffer,
	chunk->length );
	delete[] (char*) chunk->buffer;
	return o;
	}
	};

[nikoladze]

The memory leak in the example in #1400 is indeed gone

[simonmichal]

Thanks a lot!