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Add support in resource-modify for changing the project_default.

Remove interactive operations, rename default-quota to base-default.

Report quota change when moving across accounts or across containers
assigned to different projects.

Introduce ``project`` container policy. The value of this policy denotes
the project from which the container quota originate.

Further changes:
* domain argument in get_{account|container|object}_meta backend methods
  has become optional unless user defined metadata are requested
* the pithos frontend does not query anymore the astakosclient
  for the account usage; this is handled by the backend methods

Add API calls to assign a VM, network, or floating IP to a new project.

Make sure that issue_commission handles a single provision per (holder,
source, resource) tuple by merging similar provisions.

The API is responsible to provide valid data to the backend.

Add a management command that directly modifies an initialized project.

Since a user can now specify the project where a resource is assigned,
user-provided data do reach the quotaholder. A NotFound response is
thus not necessarily an internal error; the user may just not be a
member of the input project. Query the quotaholder to find out whether
this is the case and, if so, raise BadRequest.

Add optional parameter `project' in API calls that create VMs, networks,
and floating IPs. If missing, user's base project is assumed (same uuid
as the user).

Add issue_commission wrapper for assigning resources to a new project.

Both issue_one_commission and the new call issue_commission_generic act
as wrappers on top of _issue_commission. They create the appropriate
project-level provisions, based on the original ones provided by the
astakosclient user.

Add field `project' and initialize it to `userid' for all VMs, networks and
floating IPs. This means that all resources are assigned to the owner's base
project.

Remove functionality from management commands `quota' and `user-modify'
for setting base quota. They will now be handled through projects.

Also add option to delete project and user holdings that do not correspond
to actual astakos entities.

Update quota code to take into account the differentiated sources.
There is no more need to lock the user when updating quota; locking
the project is now adequate.

Update quota listing in management commands; introduce option --quota in
project-show.

Recreate quota holdings for all initialized projects and memberships.

Add flag `initialized' on ProjectMembership. It is set to true once a user
is accepted. It is used to distinguish users that have registered
project quota (but may have been removed since then).

Make base project along with the user with the same uuid. Enable the
project upon user acceptance.

Every user is associated with a special-purpose `base' project. Its
mission is to manage the user's base quota.

Field project_capacity now requires a value; field project_application
was mistakenly set nullable.

A project entry will contain all information needed to operate a project.
An application will store just the information provided by the applicant.

None will from now on denote a missing field of the application. Use empty
string for missing string and the conventional max int (2**63-1) for a
missing limit.

We need bigint in order to represent infinite as 2**63-1.

Add field `project_default' in resources. This will serve as a skeleton to
fill project quota (both project-level and member-level limits) for
resources not specified by the application.

The field is initialized by consulting the default base quota (field
`uplimit'): It is set to inf if uplimit is inf, otherwise it is set to
zero.

Each resource grant that a project provides is now also associated with
a project-level limit. This is set by consulting the existing user-level
limit and the max members allowed. If the latter limit is not set, we
consider the project's current number of active members.

Introduce field `uuid'; use it to refer to projects in the API and the
management commands.

A private project can only be accessed by its owner and its members.
No user can join the project; but the owner can enroll members.

Introduce generic notify functions that consult a dict for a given action.

Handle explicitly key paths as lists of keys. This allows the key
to be any python object, as is the case in python dicts.

Provide utility unpack() to convert from a string representation to
a list of keys. It assumes that a key is either a string or an integer
(if it looks like one).

When cloning the pithos webclient, snf-ci tries to checkout a branch
with the same name as the synnefo one (if such branch exists). To do so
it gets the list of all branches using the 'git branch' command. But
'git branch' uses the pager and so the command's output is filled with
garbage. This patch fixes that by telling git to not use the pager.

Enable eventd during prepare() so that after restarting it, init
script will not fail.
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>