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This is useful for testing corner cases efficiently.

Refer to astakosclient instead of quotaholder

Refer to astakosclient instead of quotaholder

Refs: #3543

* Substitute the PITHOS_BACKEND_QUOTA setting with two
distinct settings: PITHOS_BACKEND_ACCOUNT_QUOTA &
PITHOS_BACKEND_CONTAINER_QUOTA
* Set PITHOS_BACKEND_CONTAINER_QUOTA default value
to something big (50 TB)
* Pass account and container policies as backend
arguments arguments instead of setting them
after each backend instantiation.

Use the python-objpool package for pooling resources as object, instead
of the pooling code that existed in snf-common ('synnefo.lib.pool')

Refs #3524

Refs: commit: 56f3c759

Do not include encoded serial in the public URL.

Change PITHOS_PUBLIC_URL_MIN_LENGTH setting to 
PITHOS_PUBLIC_URL_SECURITY.

Log public set/unset functions.

Public URLs should consist of a random part.
A public URL should be unique and should not be
equal to any deleted public URL.
Finally publishing a public object has no effect.
Therefore, to generate a new public URL for an
object, the object should be unpublished and 
published again.

Allow per-service configuration of the (http) quotaholder client.
Kamaki is no longer needed in service (or ganeti) nodes,
because the client has been moved to snf-common.

Also fix the default quotaholder settings for pithos backend to be disabled
by default, and don't initialize quotaholder client when not needed.
This fixes crashes of non-user-facing pithos backend uses such as
pithcat from snf-image.

Refs #3421

Use PITHOS_USE_QUOTAHOLDER setting

backend.messages attribute was not initialized correctly, resulting in
an AttributeError exception in _pool_cleanup.

Move PithosBackendPool from snf-pithos-app to snf-pithos-backend