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

Move it here so that it can be kept in sync with openstack-common using
the new update.py script for code in openstack-common's incubation area.

See here for more details:

  http://wiki.openstack.org/CommonLibrary#Incubation

Note: this commit just moves the existing code in Nova with no other
changes. A subsequent commit will sync it with latest openstack-common
so that it is easier see the new changes.

Change-Id: If88d678b1b9bad3d37117de7f7159d7fea8ab4c8

The next obvious step in porting to cfg is to define all options using
cfg schemas directly rather than using the flags.DEFINE_* helpers.

This is a large change, but it is almost entirely pure refactoring and
does not result in any functional changes.

The only change to note is that the default values for glance_host,
glance_api_servers and default_publisher_id options are now using opt
value interpolation i.e.

 -glance_host=_get_my_ip()
 +glance_host='$my_ip'

 -glance_api_servers=['%s:%d' % (FLAGS.glance_host, FLAGS.glance_port)]
 +glance_api_servers=['$glance_host:$glance_port']

 -default_publisher_id=FLAGS.host
 +default_publisher_id='$host'

Also note that the lower_bound check on the {report,periodic}_interval
options are no more, but this has been true since cfg was first added.

Change-Id: Ia58c8f0aaf61628bb55b1b8485118a2a9852ed17

These don't do anything anymore since we just rely on optparse's
--help behaviour.

Change-Id: I7c74456a06fe924503dcfbcfa4da9fc5c26b8ab0

nova-ajax-console-proxy is overriding the logging configuration carefully
set up by nova.log.  There's no reason for it to do this, and it's the only
script in nova/bin that does.  I've removed that code.

Change-Id: I5b2d5026d529a20d26ba3bb721b15f235f6fdda8

Change-Id: Iee478c8f300b608dd153e3400bd17866f52543c5

Close the correct connection, when shutting down.  self is not defined in
this context.

Change-Id: I0dc84a1c7de468a381f5765ccba589acbc8173dd