tests/qapi-schema: Demonstrate suboptimal lexical errors

The error message for forgotten quotes around a name shows just the
name's first character, which isn't as nice as it could be. Same for
att

tests/qapi-schema: Demonstrate suboptimal lexical errors

The error message for forgotten quotes around a name shows just the
name's first character, which isn't as nice as it could be. Same for
attempting to use a number.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190914153506.2151-7-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

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