lib: use log.verbose, not log.warn

These messages aren't important enough to be `log.warn`s.

Log as verbose only; they will also appear in full error output.

Author: DeeDeeG

lib/configure.js

@@ -97,13 +97,13 @@ function configure (gyp, argv, callback) {
 
     fs.unlink(symlinkDestination, function (err) {
       if (err && err.code !== 'ENOENT') {
-        log.warn('python symlink', 'error when attempting to remove existing symlink')
-        log.warn('python symlink', err.stack, 'errno: ' + err.errno)
+        log.verbose('python symlink', 'error when attempting to remove existing symlink')
+        log.verbose('python symlink', err.stack, 'errno: ' + err.errno)
       }
       fs.symlink(python, symlinkDestination, function (err) {
         if (err) {
-          log.warn('python symlink', 'error when attempting to create Python symlink')
-          log.warn('python symlink', err.stack, 'errno: ' + err.errno)
+          log.verbose('python symlink', 'error when attempting to create Python symlink')
+          log.verbose('python symlink', err.stack, 'errno: ' + err.errno)
         }
       })
     })