Remove process.umask() call from config default

Since we now are using pacote/tar in a way that will rely on the default
process umask setting, and we set file/directory modes explicitly
anyway, there's no need to have a default umask setting that calls
process.umask()

As this method is not worker-thread safe, and is deprecated, it's best
for us to stop using it.

Fix: #1103

PR-URL: #2444
Credit: @isaacs
Close: #2444
Reviewed-by: @nlf

Author: isaacs

lib/utils/config.js

@@ -170,7 +170,7 @@ const defaults = {
   'tag-version-prefix': 'v',
   timing: false,
   tmp: tmpdir(),
-  umask: process.umask ? process.umask() : 0o22,
+  umask: 0,
   unicode,
   'update-notifier': true,
   usage: false,