Revert "network-manager-gnome: drop patch which caused gnome-keyring to be used user-added networks"

This reverts commit 4e64a9c819fd99663ef717be0fefc4fe1d84fc13.

The commit above did not disable the usage of gnome keyring.
network-manager-applet: add patch to avoid storing passwords to keyring
network-manager-applet: 0.9.8.8-0ubuntu4.2+opinsys2