change "local console access" to "the admin user"

Slightly less ambiguous by using "Require a password for the admin user"
instead of "Require a password for local console access" for password_
page and upgrade_page.

Change-Id: I0e838da773a352c8ee43c20217b72428a1138a59
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=984344
Signed-off-by: hadong <hadong0720@gmail.com>