change 'Host' object's 'host' attribute to 'host_name'

The function __repr__ of Host class which is located in hosts.py try to
access 'host' attribute, source code is "self.host",But in fact, Host object
don't has this attribute, it should be 'host_name'! We can find this attribute
from nova/api/openstack/compute/contrib/hosts.py file.

So I simply change 'self.host' to 'self.host_name'.

Change-Id: Ie76ba04da7592a596ab728fec981e9a1dbcc6a5f
Fixes: bug 1210043
Fix the help messages to specify image/flavor name

User can specify flavor/image name as the arguments of "nova boot"
command instead of their ids, but the help messages does not explain
that. This fixes the help messages.

Fixes: bug #1211156

Change-Id: I47813c8ebbe5fc83d627f016e3751918b3ab11cb
Fix and gate on H501, no locals for string formatting

Change-Id: I07e4a1a733639a343d4b3ee20927d50ba04bd7a3
Added 'nova migration-list' command

This command lets Admin's list migrations by applying filters

Implements: blueprint list-resizes-through-admin-api
Change-Id: I587c62dab537186cfc8b387fbc46cdb56fb9976c
python3: Fix imports for py2/py3

Python3 reorganized the standard library and moved several functions
to different modules. Six provides a consistent interface
to them through the fake six.moves module.

However, the urlparse, urllib2, etc modules have been combined
into one module which Six does not support so we do it via
py3kcompat.

Modules such as StringIO and CStringIO have been removed
completely so we use the io module.

Change-Id: I53adac11b634de2c710fc39def36bcec96366710
Signed-off-by: Chuck Short <chuck.short@canonical.com>
Added support for running the tests under PyPy with tox

This is a precursor to having them run under check and gate.

Change-Id: I105404d45cd4be93909ea5a272fc7e7c0c6d78cb
Merge "Fix and gate on H501, no locals for string formatting"
Merge "python3: Fix imports for py2/py3"
Merge "Fix the help messages to specify image/flavor name"
Merge "Added support for running the tests under PyPy with tox"
Merge "change 'Host' object's 'host' attribute to 'host_name'"
Merge "Added 'nova migration-list' command"