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Add tags and mode to network db model. Replace existing type with
flavor. Introduce 4 different flavors. Each flavor has mode, link,
mac_prefix, tags. Supported flavors are CUSTOM, IP_LESS_ROUTED,
MAC_FILTERED, PHYSICAL_VLAN and are hardcoded in db models.

Introduce new function that returns flavor's mode, link, mac_prefix,
tags.

In settings only DEFAULT_ROUTING_TABLE, DEFAULT_BRIDGE and
DEFAULT_MAC_PREFIX, DEFAULT_PRIVATE_BRIDGE exist.

Introduce FIELD_POOL_MAP to map flavor fields to pool tables.

Make snf-manage network-create command as flexible as possible. It is
now able to create a network based on an existing flavor and overide
defaults by passing mode, link, mac_prefix, tags option. Resource pools
cannot be used by CUSTOM flavors. Currently MAC_FILTERED and
PHYSICAL_VLAN use MacPrefixPoolTable for mac_prefix and BridgePoolTable
for link accordingly and cannot be overriden.

API blocks creation of public networks. Introduce new setting
API_ENABLED_NETWORK_FLAVORS to indicate which flavors can the end-user
use to create private networks.
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Callpoint class had a placeholder attribute original_calls
which was initialized as an empty dictionary,
and thus was usable. Class __init__() code did not initialize
original_calls as it should but because the placeholder was
usable it did not break. Alas, the placeholder is global
to all subclasses and their instances and one instance
leaked attributes and functionality to the other.

This caused the kamaki quotaholder client to be hijacked
and directly call the backend, which was available
on the same system/gunicorn deployment in our tests.
The backend was directly called from an astakos view that
had no transaction active (i.e. was on auto-commit).
Normally, the backend would be called from the
quotaholder_app view, which explicitly sets up a transaction.

Implement quotas-init and quotas-verify management commands.
- quotas-init sets quotas of Quotaholder to the state of quotas in
  Cyclades DB
- quotas-verify detects incosistencies between quotas in Quotaholder and
  Cycldes DB.

list_holdings() to be used to get all holdings for multiple resources
without having to call list_resources/get_holding for each entity/holding.

This reverts commit 5cb79e68bb1e0b443b62ec1ffe7b005bbf806b91.

- initialize quotaholder client with the token from
  setting CYCLADES_QUOTAHOLDER_TOKEN

- rename setting USE_QUOTAHOLDER to CYCLADES_USE_QUOTAHOLDER

Quotaholder returns 403 invalid token if the request's
X-AUTH-TOKEN header does not match settings.QUOTAHOLDER_TOKEN

Conflicts:
	snf-cyclades-app/synnefo/api/servers.py