Removes copy of ajaxterm code, nova-ajax-console-proxy,
and support for get_ajax_console from Nova proper.

Implements blueprint remove-ajaxterm
Fixes bug 917963

Change-Id: I2c0ff427c53c0f63a18b10475d6b4cbe9a085d83

Fixes bug #910763

According to PEP8,
- Object type comparisons should always use isinstance() instead
      of comparing types directly.

        Yes: if isinstance(obj, int):

        No: if type(obj) is type(1):

      When checking if an object is a string, keep in mind that it might be a
      unicode string too! In Python 2.3, str and unicode have a common base
      class, basestring, so you can do:

        if isinstance(obj, basestring):

Change-Id: I7c0fdecf99872f5b8f72b2c2ed4f5c539c33def1