get_require_restart_worst

This method returns the 'worst' restart of all the transactions.

It is needed as multiple sub-transactions may emit require-restart with different values, and we always want to get the most invasive of all.

For instance, if a transaction emits RequireRestart(system) and then RequireRestart(session) then pk_client_get_require_restart will return system as a session restart is implied with a system restart.

Parameters:

this	a valid Results instance

Returns:

a Restart value, e.g. PK_RESTART_ENUM_SYSTEM