Load Copy Of Template raises 'cannot pickle 'socket' object'

After defining protocol and setting up value and socket for it the `Load Copy Of Template` can't be used. Test raises an error
```
TypeError: cannot pickle 'socket' object
```

As a workaround I comment out deep copy of template in function:
```
def load_copy_of_template(self, name, *parameters):
"""..."""
template, fields, header_fields = self._set_templates_fields_and_header_fields(name, parameters)
# copy_of_template = copy.deepcopy(template)
copy_of_fields = copy.deepcopy(fields)
self._init_new_message_stack(template, copy_of_fields, header_fields)
```

Can this be fixed?

Locate load_copy_of_template and inspect how template, fields, protocol values, and sockets are set up before the failing deepcopy(template) call. Reproduce the error with Load Copy Of Template, then add or update a regression test showing that a template containing a socket can be copied without the cannot pickle socket object failure.

Written by the indexing model from the issue text.