Set focus on site-map and user menu

Set focus on first item in the site-map and user drop down for keyboard users, so they can quickly tab to the link/item of their choosing.
https://meta.discourse.org/t/keyboard-shortcuts-wish-list/15952
Added a:first
FIX: Remove up/down key bindings for search results

Up/down key bindings make it difficult to access Show More on search results.
https://meta.discourse.org/t/keyboard-users-cant-select-show-more-in-search-results/19394
FIX: Remove up/down key bindings for search results

Up/down key bindings make it difficult to access Show More on search results.
https://meta.discourse.org/t/keyboard-users-cant-select-show-more-in-search-results/19394
Correct Perform Search Test
Correct Perform Search Test
Merge pull request #2715 from cpradio/master

UX: Add focus to menu only if it comes from a keyboard shortcut and improve keyboard functionality for search