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Padding should not be considered when counting unavailable entries.

All django apps need a models.py file

Use image_backend context manager to ensure that ImageBackend is always
closed. list_images method did not close the ImageBackend, which
resulted in depletion of the Pithos backend connection pool.

LOGGING has been renamed to LOGGING_SETUP

Use 'factory_boy' library for creating Django ORM objects as test data.
These factories can be used as fixtures replacement since they are
easier to write and maintain.

Refs #3097

Do not allow creation of more than one Bridge or MacPrefix pool, since
we can not handle them yet.

The callpoint takes care of committing.

if part of the request is rejected.

If such a call returns a non-empty list, this means that
the entire call failed due to the actions mentioned in the list.

Make reconcile-servers perform reconciliation only for the specified
backend.

Modify reconcile-servers to not communicate 2 times with Ganeti
to get the operstate and the NICs of the VMs. Merge this two one
call.

Make backend-modify drained argument as --drained=True|False instead
of --drained and --no-drained. The same for offline.

Rename `snf-manage reconcile` management command to `snf-manage
reconcile-servers`, to be consistent with `snf-manage
reconcile-networks`. Also, treat '--detect-all' option as default
when no other '--detect-*' is specified.

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>