xenapi: display IP and DevStack result on console

The devstack setup service can update /etc/issue, displaying the status
of the installation and the VM's management IP. With this change, after
the devstack service finsihed, the login prompt will look like this:

OpenStack VM - Installed by DevStack
  Management IP:   10.219.3.108
  Devstack run:    SUCCEEDED

DevStackOSDomU login:

This helps people to log in to their system.

Change-Id: Idd6bbd5faf9ced5618cd3e95191bfc3b89473fa2
Make tempest L3 capable plugin aware.

With this patch, the public network config in tempest.conf will be
done for the plugins that support L3.

Change-Id: I820fe300fac45ff92d1281ff0c43ebc137783210
Assign unique name to each fake nova-compute

Without a unique name, the scheduler (and anything else, really) will
consider each of these nova-compute processes as being one and the same,
so only one entry in the services table, only one hypervisor seen by the
scheduler, etc. Assigning unique names lets us simulate an arbitrary
amount of nova-computes which is very handy for benchmarking the
scheduler.

Change-Id: Ie03aad81bd2a8e73b876a9eae934bc00bf2f71e9
Setup user and endpoints for Savanna

* create savanna user with admin role for auth token checks
* create service data_processing
* create savanna endpoint
* use savanna user for auth token checks

It's needed for running tempest tests.

Change-Id: Iff26960746e36012c275f43c0de0dedcaebc8b0a
Merge "Make tempest L3 capable plugin aware."
Merge "xenapi: display IP and DevStack result on console"
Merge "Setup user and endpoints for Savanna"
Fix a couple of INI whitespace bugs

* iniset() bails if no section or option (attribute) is supplied
* merge_config_file() properly skips lines with only whitespace

* Also split the ini-tests into their own script

Bug 1257954

Change-Id: Ie31c5bd0df8dfed129fbcf1e37228aaf25e9305d
Merge "Assign unique name to each fake nova-compute"