[vcloud_director] ensure that MetadataEntry is a list
[vcloud_director] Show guest customization "admin password auto"

Guest customization setting "admin password auto" was retrieved but not
shown.
[vcloud_director] Handle Guest admin password

Admin passwords can be retrieved and modified using the VMWare console,
so it's useful to allow the same operations here.

Moreover, when an admin password is enabled and "admin password auto" is
false, it's impossible to modify Guest settings.
i.e., "The administrator password cannot be empty when it is enabled and
automatic password generation is not selected."

This patch also fixes `put_guest_customization_section_vapp` where an
AdminPassword element was never created.
[xenserver] Adding more XenServer Models
Adding more XenServer models
[general] Allow default wait_for interval to be overiden globally.
Merge remote-tracking branch 'upstream/master'
ignore .ruby-version
Create parser for AWS assign private ip addresses
Assign private ip parser
add assign private ip request path
Forget to reference models on main class
Merge pull request #2480 from alphagov/ruby_version

ignore .ruby-version
Merge pull request #2475 from zertico/adding_more_models

[xenserver] Adding more XenServer Models
expanding/rewriting the getting-help/involved section of README
fix spacing for getting help section of README
Merge pull request #2459 from alphagov/ensure_metadata_entry_is_list

[vcloud_director] ensure that MetadataEntry is a list
vApp rename via put_vapp_name_and_description
Merge pull request #2464 from astratto/guest_password

[vcloud_director] Fix Guest admin password settings
use std options={} format for optional parameters