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This is to preserve name of called function.

Replace custom transaction context with:

- decorator `commit_on_success_strict', which uses
  transaction.commit_manually and ensures that
  the transaction rolls back on any exception

- context ExceptionHandler, which logs and
  suppresses exceptions

Create three new management commands for listing, showing and modifying
a pool.

* listservers
* showserver
* modifyserver

Also remove aai and helpdesk apps

split out of some commonly used code in a seperate package

since more than one packages exist in repository root

- updated test settings module
- fixed multiple venvs runner

Split settings.py.dist in distinct conf files under settings.d/,
similarly to:

https://code.djangoproject.com/wiki/SplitSettings#UsingalistofconffilesTransifex

Use settings..d/*-local.conf files for local modifications,
update .gitignore to ignore them.

Refs #693

Refs #659

Thanks to [faidon] for the tip

Refs #659

Merge branches api-current and ui-0.4:
    * Fix merge conflicts
    * Fix minor bug in reconciliation mgmt command
    * Add comments in settings.py.dist
    * minor PEP8 fixes

* Create Ganeti network link when creating a network.
* Delete the link when deleting the network.
* Use a pool of GANETI_MAX_LINK_NUMBER network links.
* Adding or removing a server from a network requires reboot.

A database migration is needed.

Refs #513
Refs #411

Modify db/fixtures/initial_data.json and settings.py.dist to
fix the duration of the test token.

Fix minor bug in api/util.py when no valid SynnefoUser
could be found or the provided X-Auth-Token was invalid.