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Improve performance

Refs: #3510

Conflicts:
	snf-pithos-app/pithos/api/util.py

If the updated object exceeded the size of the original object
the object size was not computed correctly.

Refs: #3554

If update md5 is deactivated Pithos does not return an etag header.
Pithos in that case should return the merkle hash as etag

Conflicts:
	snf-astakos-app/astakos/api/tokens.py
	snf-astakos-app/astakos/im/tests/api.py
	snf-common/synnefo/settings/test.py
	snf-django-lib/snf_django/lib/api/__init__.py
	snf-django-lib/snf_django/utils/testing.py
	snf-pithos-app/pithos/api/functions.py
	snf-pithos-app/pithos/api/settings.py
	snf-pithos-app/pithos/api/test/__init__.py
	snf-pithos-app/pithos/api/test/accounts.py
	snf-pithos-app/pithos/api/test/containers.py
	snf-pithos-app/pithos/api/tests.py
	snf-pithos-app/pithos/api/util.py

This is useful for testing corner cases efficiently.

Remove backend_method decorator and move logic in the pithos api method

Conflicts:
	snf-pithos-app/pithos/api/util.py

Openstack storage api sets to 10000 the maximum number of
items returned by the listing functions.
However to test this behaviour is time consuming.
Change this threadhold to be adjustable via the settings
(still defaults to 10000) so the tests can override it.

* tenantName is optional in the request
* check whether the token holder is active and the token has not been
  expired
* update and fix the tests
* update the docs

Add migration file for floating IPs and VM task state.

Fix exception message when trying to connect an instance to a non-active
public network.

Rename reserved work for automatically choosing a public network from
"public" to "SNF:ANY_PUBLIC". Also add the setting description to conf
files.

Cyclades API should return "floating" for the OS-EXT-IPS:type attribute.

Extend NetworkInterface model with a property showing if the IPv4
address of the NIC is a floating IP or not. Also, simplify some
relevant code.

Function for creating a server have been moved from api to logic.

Remove PUBLIC_USE_POOL setting, since in order to use floating IPs, the
cyclades must be responsible for managing all IP pools.

Remove code handling networks from network API views to logic.networks

Fix some issues regarding floating ips introduced by rebasing branch.

Add '--floating-ip-pool' option to 'network-create' management command.
Networks that have this option set must be created to all Ganeti
backends.

Extend Network model with the 'floating_ip_pool' boolean field, to
indicate whether a Network can be a floating IP pool or not. Networks
that are floating IP pools must exist in all Backends, and so
'snf-manage backend-add' should try to add them.

Also, update reconciliation to create networks that are floating IP
pools to the Ganeti backends that do not exist.

Extend POST /servers API call, to take an optional attribute
'floating_ips', which is a list of floating IP addresses. The server
will have one NIC for each of this addresses after the
'DEFAULT_INSTANCE_NETWORKS' and before any private networks that the
user has chosen. All of the addresses must first be reserved through the
/os-floating-ips API.

Add 'DEFAULT_INSTANCE_NETWORKS' setting that can be used by the
administrator to define the list of networks that each server that is
created must be connected to. Each created VM will have a NIC connected
to each of these networks. This settings can include a list of network
UUIDs or the special "public" ID, which corresponds to any public
network that has a free IP address.

Also, extend POST /servers API call, with an optional 'networks'
attribute, that the user can use to define a list of private networks
that wants it's VM to be connected.

Make 'pool' attribute of POST /os-floating-ips request optional. If
attribute is missing, the server will allocate a floating IP from one of
the available public networks.