Created the State.test_bug_21716_no_cdp_state_save system test.
This is for catching bug #21716 (https://gna.org/bugs/?21716), the failure to save the relax state just after deleting the current data pipe, even if other data pipes exist.
Authored by: bugman 2014-02-23
Parent: [r22251]
Child: [r22253]
