Combobox keyboard support

Combobox can be controlled just by using keyboard.

When value list is closed, user can:
  * use UP and DOWN error to open list, it will focus the list and
    select previous/next value
  * when CB is non-editable, user can start typing, first character will open
    list, second will be entered into search input. Note: I wanted to copy the
    first char to the search box as well, but I did not figure out reliable
    method for converting keycode to char for non ASCII keyboard layouts
  * ESCAPE, ENTER, TAB keys are handled to allow keyboard operations in a
    container

When value list is opened:
  * CB tries to keep focus on either search input or a select
  * when focus is lost, the value list is closed. So  user can click anywhere
    on a page to close it - two comboboxes can't be opened on the same time
  * hitting TAB key switches between search and select
  * if CB is not searchable, hitting TAB will close the value list and select
    input textbox
  * hitting ESCAPE on will close the value list
  * hitting ENTER on search input will invoke search operation
  * hitting ENTER on select will close the value list
  * hitting UP/DOWN arrows will select previous/next values

Additional modifications:
  * opening arrow and search button were made non-focusable. It fixes the
    'wrong focus area' bug and simplifies keyboard usage. It doesn't affect
    mouse usage.

https://fedorahosted.org/freeipa/ticket/3324

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