hg: shenandoah/jdk10/hotspot: Rename flag to ShenandoahGuaranteedGCInterval

[ashipile at redhat.com]

Changeset: 46f956a18e1c
Author:    shade
Date:      2017-08-04 19:48 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/hotspot/rev/46f956a18e1c

Rename flag to ShenandoahGuaranteedGCInterval

! src/share/vm/gc/shenandoah/shenandoahCollectorPolicy.cpp
! src/share/vm/gc/shenandoah/shenandoah_globals.hpp
! test/gc/shenandoah/TestPeriodicGC.java