Revert "Revert "Delete checked-in Git cookies""

This reverts commit a6f225e44a3ddaf63aacc93263db884600b3ae1a.

Reason for revert: Reapplying

Change-Id: Iaacf04389730da198bfad1a350c211f2d85283da

test/slow/nvm_get_latest/nvm_get_latest

diff --git a/test/slow/nvm_get_latest/nvm_get_latest b/test/slow/nvm_get_latest/nvm_get_latest
index 5311360..1716478 100755
--- a/test/slow/nvm_get_latest/nvm_get_latest
+++ b/test/slow/nvm_get_latest/nvm_get_latest
@@ -51,8 +51,6 @@
   Vary: X-PJAX
   Location: $URL
   X-UA-Compatible: IE=Edge,chrome=1
-  Set-Cookie: logged_in=no; domain=.github.com; path=/; expires=Fri, 22-Dec-2034 02:11:15 GMT; secure; HttpOnly
-  Set-Cookie: _gh_sess=eyJzZXNzaW9uX2lkIjoiNTMzNGNjZWUxM2VhZjNhN2M3MzIwZWUxNGYwNzhmNDkiLCJzcHlfcmVwbyI6ImNyZWF0aW9uaXgvbnZtIiwic3B5X3JlcG9fYXQiOjE0MTkyMTQyNzV9--e2fa4cf5305d61aa58c0e0bf21fdb335a9660dcf; path=/; secure; HttpOnly
   X-Request-Id: 4b99bf200157dd845f76ab83e4093acc
   X-Runtime: 0.030872
   X-Rack-Cache: miss
@@ -73,7 +71,6 @@
   Cache-Control: no-cache, private
   Vary: X-PJAX
   X-UA-Compatible: IE=Edge,chrome=1
-  Set-Cookie: _gh_sess=eyJzZXNzaW9uX2lkIjoiNTMzNGNjZWUxM2VhZjNhN2M3MzIwZWUxNGYwNzhmNDkiLCJzcHlfcmVwbyI6ImNyZWF0aW9uaXgvbnZtIiwic3B5X3JlcG9fYXQiOjE0MTkyMTQyNzUsIl9jc3JmX3Rva2VuIjoiemZTVDNIRGo0QzF0dzkyNXp6NFBRdGJVbTl4NSsxTGo1cngwVFQ3NDVwdz0ifQ%3D%3D--b72bfd5241907dcf557b226e74351ff39f0e9ede; path=/; secure; HttpOnly
   X-Request-Id: 305b0d158bf8c0b3fa488a33d7687091
   X-Runtime: 0.038544
   X-Rack-Cache: miss