Unlink socket before using (#2181)

See https://stackoverflow.com/a/34881585/4283659

Closes #1538

.eslintrc.yaml

@@ -30,6 +30,7 @@ rules:
   eqeqeq: error
   import/order:
     [error, { alphabetize: { order: "asc" }, groups: [["builtin", "external", "internal"], "parent", "sibling"] }]
+  no-async-promise-executor: off
 
 settings:
   # Does not work with CommonJS unfortunately.