child_process: refactor self=this in socket_list
Pull Request check-list
Affected core subsystem(s)
child_process
Description of change
The socket list module (used by child_process) currently uses the var self = this;
pattern for context in several places, this PR replaces this with arrow functions or passing a parameter in where appropriate.
Note that the var self = this
in the _request is intentionally left in place since it is not trivial to refactor it and the current pattern isn't bad given the use case.