Support for inline link creation

Basic support for creating new compute instances with inline links.

~~~
Category: compute;scheme="http://schemas.ogf.org/occi/infrastructure#";class="kind";location="/compute/";title="compute resource"
Category: uuid_ttylinux_0;scheme="http://occi.localhost/occi/infrastructure/os_tpl#";class="mixin";location="/mixin/os_tpl/uuid_ttylinux_0/";title="ttylinux"
X-OCCI-Attribute: occi.core.id="aca74757-9718-46a8-addb-8ee797098f57"
X-OCCI-Attribute: occi.core.title="test"
X-OCCI-Attribute: occi.compute.hostname="test"
Link: </storage/1>;rel="http://schemas.ogf.org/occi/infrastructure#storage";self="/link/storagelink/6b86e03a-838f-4ab0-987c-bc759e553087";category="http://schemas.ogf.org/occi/infrastructure#storagelink";occi.core.id="6b86e03a-838f-4ab0-987c-bc759e553087";occi.core.target="/storage/1";occi.core.source="/compute/aca74757-9718-46a8-addb-8ee797098f57"
Link: </network/0>;rel="http://schemas.ogf.org/occi/infrastructure#network";self="/link/networkinterface/bc57bcd0-a0c9-408e-883d-ea4bb5cfb951";category="http://schemas.ogf.org/occi/infrastructure#networkinterface";occi.core.id="bc57bcd0-a0c9-408e-883d-ea4bb5cfb951";occi.core.target="/network/0";occi.core.source="/compute/aca74757-9718-46a8-addb-8ee797098f57"
~~~

## Done
* Support in ONE backend

## TODO
* Support in EC2 backend