GitLab

Added log folder option / Now delete-stale deletes also stale networks / Fixed failed testcases output not "None"

- bump snf-common required version
- replace ampqlib to puka

Also improve documentation of quota settings.

- New dict setting VMS_USER_QUOTA to allow setting per user quota
  (overrides MAX_VMS_PER_USER setting)
- Private networks quota mechanism (based on MAX_NETWORKS_PER_USER and
  NETWORKS_USER_QUOTA settings)
- Different response message for GANETI_MAX_LINK_NUMBER overlimit
  errors (To differentiate from user quota overlimit error). Backend
  not raises NetworkLink.NotAvailable exception when no available link
  can be created.
- Additional unittests for vms/networks quotas

Conflicts:
	snf-cyclades-app/synnefo/logic/callbacks.py