Fixed require for vagrant-openstack-plugin lib files
Removed strict host checking from sync and added .vagrant exclusion

When rsyncing folders over to the new instance host checking should not happen
so IP addresses can be reused on smaller local clouds, and this will also
prevent the host trust prompt from being displayed. The .vagrant folder should
not be synced over. Changes were taken from the vagrant-aws plugin:
https://github.com/mitchellh/vagrant-aws/blob/master/lib/vagrant-aws/action/sync_folders.rb#L48
Added support for nics configurations to allow for selection of a specific network on creation

A new network configuration option has been added that will allow for
an instance to be configured to use a specific network. If a network is
provided when the ssh_info it read the network name will be used to retrieve
the correct ip address. On openstack connect a reference to the network
endpoint has been added if a network configuration is provided. Nics support
was added in fog 1.10.1 so the gemspec has been updated to reflect this
requirment.
Added the ability to pass metadata keypairs to instances

The configuration will now accept metadata configurations in the form of a
hash and pass those into the instance.
Merge branch 'add_nics_support'