scripts/qmp: delete 'qmp' script

scripts/qmp: delete 'qmp' script

This script has not seen a patch that was specifically for this script
since it was moved to this location in 2013, and I doubt it is used. It
uses "man qmp" for its help message, which does not exist. It also
presumes there is a manual page for qmp-XXX, for each defined qmp
command XXX. I don't think that's true.

The format it expects arguments in is something like:

block-dirty-bitmap-add --node=foo --name=bar

and has no capacity to support nested JSON arguments, either.

Most developers use either qmp-shell or socat (or pasting JSON directly
into qmp stdio), so this duplication and additional alternate syntax is
not helpful.

Remove it. Leave a breadcrumb script just in case, to be removed next
release cycle.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20201019210430.1063390-1-jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>