GitLab

Run 'devflow-update-version' to create all the version files, before
trying to build the docs.

Guess the branch to build, based on the current branch of the
repository. Also track all remote branches when cloning Synnefo, because
it is needed by devflow.

Add '--fetch-packages' option to snf-ci script, in order to download the
created debian packages.

Add 'config_file' argument to SynnefoCI in order to use a different
configuration file. Also, added the corresponding option to 'snf-ci'
scirpt.

Make 'ssh_keys' and 'accept_ssh_from' optional, since there are not
mandatory for ci to work.

Remove the 'deploy_on_io' option. Instead check if you will need to
compute manually the ssh port by the domain of the cyclades url.

Add option to use a custom image_id and flavor_id instead of getting
them from config file.

Get credentials for deployment from .kamakirc instead of config file.
Also, add option in config file indicating which cloud for kamaki to
use. Finally, add option in SynnefoCI to override the cloud from config.

Refs #4193

Add option for copying ssh keys to the created vm.

* override config file from env variable
* pep8 fixes
* do not display vm password
* fail if cloning repo fails
* do not use eval

Spawn VM to use as builder-slave.
Build packages inside this VM.
Deploy Synnefo using snf-deploy.
Run unit tests.
Run functional tests using burnin.