Move request-specific description to GraphControl class
Split error report generation into separate method

- Keep default error generation using response parameters in CmdControl
- Overload create_error_report() in Chgrp and Delete commands to handle MIF exceptions
Add target for building virtual image
Remove dependency on init target for building Virtual Image

Allows to build the VM without initializing the submodules
Execute VM creation script in remote directory
Fix wording of fileset delete/chgrp exceptions
Use the VMAME variable directly as the OVA name
Merge pull request #1195 from sbesson/10783_cli_graphconstrainterr

CLI: handle MIF exceptions (#10783)
Merge pull request #1220 from sbesson/build_vm_target

Add target for building virtual image