Eric Blake 1c56b9fe53 virsh: add option aliases
In the past, we have created some virsh options with less-than-stellar
names.  For back-compat reasons, those names must continue to parse,
but we don't want to document them in help output.  This introduces
a new option type, an alias, which points to a canonical option name
later in the option list.

I'm actually quite impressed that our code has already been factored
to do all option parsing through common entry points, such that I
got this added in relatively few lines of code!

* tools/virsh.c (VSH_OT_ALIAS): New option type.
(opts_echo): Hook up an alias, for easy testing.
(vshCmddefOptParse, vshCmddefHelp, vshCmddefGetOption): Allow for
aliases.
* tools/virsh.pod (NOTES): Document promise of back-compat.
* tests/virshtest.c (mymain): Test new feature.
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