Add support for changing zone-wide values in R_GRID_CONFIGURATION table

## Enhancement

The following icommands are good reference material for this:
- `iadmin get_delay_server_info`
- `iadmin set_delay_server HOSTNAME`
- `iadmin get_grid_configuration_value NAMESPACE OPTION_NAME`
- `iadmin set_grid_configuration_value NAMESPACE OPTION_NAME OPTION_VALUE`