Missing package dependancies added.

A missing "config" parameter for qemu-nbd based seeding
method added.

A new seeding method utilising Cloud-init added.
The qemu-nbd based method is still a default method
for backward compatibility.

To enable cloud-init, set the "seed" parameter on
a cluster or node level to "cloud-init".
To disable seeding, set this parameter to "false".
Setting this parameter to "true" will default to
the "qemu-nbd" method.

Salt Minion config file will be created automatically
and may be overrided via cluster or node level
metadata:

  salt:
    control:
      cluster:
        mycluster:
          seed: cloud-init
          cloud_init:
            user_data:
              salt_minion:
                conf:
                  master: 10.1.1.1

or for qemu-nbd case:

  salt:
    control:
      cluster:
        mycluster:
          seed: true
          config:
            host: 10.1.1.1

That may be useful when Salt Master has two IPs in
different networks and one of the networks isn't accessible
from a VM at the moment it's created. Setting a reachable
Salt master IP from metadata helps avoid potential problems.

Also, a liitle optimization has been done to parse/dump
an libvirt XML only once while modifying it.

Change-Id: I091cf409cb43ba2d0a18eaf2a08c11e88d0334e2
Closes-Bug: PROD-22191

Related bug: PROD-20531

Change-Id: Ia00a4310c5e1ec590ddd9c16b8013e42198632ac

Change-Id: Ic3499c2740794f4fc9196316e97bbb0bfa6fde07

Change-Id: Idf6c18597a222e6c1b60bf940eadb1d6d8a611c7

Our formula strictly rely on cherrypy framework when running salt API.
This patch adds that dependency to api packages as when installing
recommended is disabled it won't be installed by default.

Change-Id: I12d9368b17f2d0bc33dded2d1a9c8abd9bfcd0b1
Related-Prod: PROD-18105

salt-minion started via upstart is not using /etc/environment to
source variables therefore is not using system wide http_proxy parameters if
they are set there. With this patch if salt.minion.env_vars is set to engine:
file salt will set envvars in /etc/default/salt-minion and will use them for
all commands executed remotely via salt. Since /etc/default is not used on
systems with systemd override for salt-minion to use /etc/environmnet will be
set.

Change-Id: Icfe122de2486a83820a0bd2e2aeea4be3796c6aa
Closes-bug: PROD-16676

Change-Id: I3ddfb01dd785f559e4bbf197bc164b8d0389a4f1

Change-Id: If8ee6ccfd282d8f926eff268cd74871e0f400754

It adds oauth package to 'dependency_pkgs' and
'dependency_pkgs_pip' sections to have it installed
by system package manager or by pip.

Change-Id: I2e799c92c6e6f7c0705bb962ac32b8c166723af1

Change-Id: I1d09c5297440a6469cfaabbfc67d1f1c11decece

Change-Id: Id84434f5e0b699a00d0165a3e2318f4ad54f530d

Allows handling of large output (default 1mb, now 100mb)

Change-Id: Ic5c09155a14003747696c9974b19d21896bf881c

Change-Id: I73a4a14734651f6483fae169a2290e9c5b377d76

Change-Id: I6f1292779858c45f9cf6f4caf3657ee000b2cf06

Change-Id: I2b8ee84718e10d6261f1c93ca02ff4b60977e37f

Change-Id: I1e1269268a81d8cd01b5fe9328f63e8bf85e941b

Change-Id: I2aba1213b1dda46aee929b8ea583c41316e3eb0b

source:engine metadata created - defaults to pkg
installation, pip installation alternative added