virsh: suppress aliases in group help
virsh: suppress aliases in group help

'virsh help | grep nodedev-det' shows only nodedev-detach, but
'virsh help nodedev | grep nodedev-det' also shows the old alias
nodedev-dettach that we intentionally hid in commit af3f9aab.

See also commit 787f4fe and this bug report:
https://bugzilla.redhat.com/show_bug.cgi?id=956966

* tools/virsh.c (vshCmdGrpHelp): Copy suppression of vshCmdHelp.

Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

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