Add target for building virtual image

(cherry picked from commit 44165712e5e941b805b6493902f92c79704e9688)
Remove dependency on init target for building Virtual Image

Allows to build the VM without initializing the submodules

(cherry picked from commit 929bcab03dfb536b20c70ab850bd291059ee73cc)
Execute VM creation script in remote directory

(cherry picked from commit 1b24b698150c6173c6cc8d7bd7079e28c2b0f7a7)
Use the VMAME variable directly as the OVA name

(cherry picked from commit 12310265d1c31e075c03e94d09f39845b051ab46)
Use full omero.version to generate the ova name

(cherry picked from commit 9c9467bfa896e676391c203629743c51cc0df521)