[cfggen] Allow Write To Redis DB With Template/Batch Mode (#5203)

Argument to write to config-db is not allowed when using template.
This PR allows cfggen to write to redis db when using template
mode.

signed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>

src/sonic-config-engine/sonic-cfggen

@@ -266,10 +266,10 @@ def main():
  parser.add_argument("-T", "--template_dir", help="search base for the template files", action='store')
  group.add_argument("-v", "--var", help="print the value of a variable, support jinja2 expression")
  group.add_argument("--var-json", help="print the value of a variable, in json format")
- group.add_argument("-w", "--write-to-db", help="write config into configdb", action='store_true')
  group.add_argument("--preset", help="generate sample configuration from a preset template", choices=get_available_config())
  group = parser.add_mutually_exclusive_group()
  group.add_argument("--print-data", help="print all data", action='store_true')
+ group.add_argument("-w", "--write-to-db", help="write config into configdb", action='store_true')
  group.add_argument("-K", "--key", help="Lookup for a specific key")
  args = parser.parse_args()