qapi: Enforce command naming rules

Command names should be lower-case.  Enforce this.  Fix the fixable
offenders (all in tests/), and add the remainder to pragma
command-name-exceptions.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210323094025.3569441-25-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
diff --git a/scripts/qapi/source.py b/scripts/qapi/source.py
index d8f9ec3..03b6ede 100644
--- a/scripts/qapi/source.py
+++ b/scripts/qapi/source.py
@@ -21,6 +21,8 @@ class QAPISchemaPragma:
     def __init__(self) -> None:
         # Are documentation comments required?
         self.doc_required = False
+        # Commands whose names may use '_'
+        self.command_name_exceptions: List[str] = []
         # Commands allowed to return a non-dictionary
         self.command_returns_exceptions: List[str] = []
         # Types whose member names may violate case conventions