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
Fix wording of fileset delete/chgrp exceptions
Merge pull request #1195 from sbesson/10783_cli_graphconstrainterr

CLI: handle MIF exceptions (#10783)