Get CockroachDB version from the connection info

tests/testutils.py

@@ -424,13 +424,10 @@ def crdb_version(conn, __crdb_version=[]):
     if __crdb_version:
         return __crdb_version[0]
 
-    with conn.cursor() as cur:
-        try:
-            cur.execute("show crdb_version")
-        except psycopg2.ProgrammingError:
+    sver = conn.info.parameter_status("crdb_version")
+    if sver is None:
         __crdb_version.append(None)
     else:
-            sver = cur.fetchone()[0]
         m = re.search(r"\bv(\d+)\.(\d+)\.(\d+)", sver)
         if not m:
             raise ValueError(