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Change SQLAlchemy dependency version to match
with the one found in Debian wheezy.

This commit reverts commits #07602322 and #30514662 which introduced a
bug in dispatcher's logic. These commit fixed the issue that, in a case
the Cyclades DB is unsynced with Ganeti, a resource that does not exist
in the Ganeti backend, it  will not be deleted from DB in case the
remove job fails.

This commits fixes this issue, by quering Ganeti each time a failed
OP_INSTANCE_REMOVE or OP_NETWORK_REMOVE is processed.

* Provision quantity sent should not be of type Decimal
  (not JSON serializable)
* Fix check for user existance in the database

Replace the regexp in mail_admins_safe() with manual parsing of the message.

This reverts commit 8414859f4895e4c67ff0bb13a8d7078c1851596a.

This commit with the current backend implementation
has broken the command for sqlalchemy module.

* Improved performance (reduce interaction with the database)
* Fix command when `userid` option is provided

Conflicts:
	snf-pithos-app/pithos/api/management/commands/reconcile-resources-pithos.py
	snf-pithos-backend/pithos/backends/lib/sqlite/node.py

Add greenlet tracing code in snf-common, useful for debugging stuck
gevent gunicorn workers.

If the environmental variable SYNNEFO_TRACE is set to a non-empty
string, the tracing code will install a SIGTRAP signal handler for the
process, after the Synnefo settings have been imported.

Sending a SIGTRAP signal to the process (eg a gevent gunicorn worker)
will then print the stack trace of each greenlet spawned within the
process to stderr.

in default RDP connection profile served by synnefo

* If no token found in the cookie redirect to astakos login
with next parameter pointing to the request path
* Extend the list of the valid response statuses
* If no expected response status is received, pass to the raised
exception the response status instead of the whole response.

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

although CONTACT_EMAIL is not a branding setting, we use the branding mechanism
to expose it to brandable templates for practical reasons.

This also fixes the missing contact email from all project related emails.

When approving a modification, automatically set the project to active,
if it has been deactivated.

Blocksize was undefined for the blocker that combines files and rados objecsts.
Define it, according to the block parameters.

How vm connection user gets resolved:

- Use the last user in `users` vm metadata if exists
- Use the last user in `users` vm image metadata if exists
- Use root if vm's image osfamily metadata is Linux
- Use Administrator if vm's image osfamily metadata is windows