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check_ganeti_master function was called in start before checking the
SNF_EVENTD_ENABLE config option. Move it just before eventd_start, just as in
restart.

Introduce the 'force-start' option in snf-ganeti-eventd init script.
When invoked with force-start snf-ganeti-eventd will start regardless
the node's role or the default settings. It will start:

 * even if the host is NOT the Ganeti master
 * even if snf-ganeti-eventd is NOT enabled in the defaults file

'force-start' should be used only during the preparation of a node to
become a Ganeti master a.k.a during a master-failover.

Modify snf-ganeti-eventd in order to get the name of the Ganeti cluster
from shared configuration files (ssconf) instead of performing a LUXI query.
Performing a LUXI restricts eventd to run only on the master node.

Do not allow any modification of any administratively suspended VM through the
API.

Add extra command line arguments, to allow the user specify the
link and mac_prefix of the new network if needed.

Return ServiceUnavailable, instead of OverLimit, when pools of bridges,
mac-prefixes or IPs run out of resources.

Modify snf-manage {server, network, flavor}-list to list by default only
non-deleted entries. The `--deleted` flag can be used  to also include
deleted ones.

Conflicts:
	snf-cyclades-app/setup.py

Implement a new command which consumes all the messages from the
dead-letter queues and re-sends the messages back to the snf-dispatcher
in order to handle them again.

Messages are annotated with "from-dead-letter" field in order to detect
looping between the original exchange and the dead-letter exchange. If a
loop is detect the message is discarder, unless the --keep-zombies
option is used.

Introduce a new setting (UI_CHANGES_SINCE_ALIGMENT) to allow aligment of
changes-since attribute of consiquent API calls.

Dummy-save the Network when processing messages from Ganeti hooks
about a VM NICs. This is needed, because the UI uses the HTTP changes-sinces
when requesting VMs and Networks, and combines the result in order to show
the new NICs. Not updating the Network object, resulted in VMs IPv4
and IPv6 shown as not set.

Modify snf-dispatcher callbacks in order to reject messages that caused
an unknown exception. Because a dead-letter-exchange is associated
with the queues that snf-dispatcher is using, these messages will be
transfered to the dead-letter-exchange.

Modify snf-dispatcher in order to declare the dead-letter exchanges and
queues

to reflect support for multiple Ganeti backends and minor fixes.
Also remove it from the general Admin Guide and give it a separate
section in the index.rst

Also add support for custom headers when publishing messages.

Basic_nack method is not support by puka. We are implementing
basic_nack as basic_ack since they have the same effect when
multiple and requeue options are not used.

Use cache in order to speed-up the output of server-list