hg: jdk/sandbox: Rename flush to flush-interval and add test for jcmd and -XX:StartFlightRecording

[erik.gahlin at oracle.com]

Changeset: 588a3f63efff
Author:    egahlin
Date:      2019-08-23 15:34 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/588a3f63efff

Rename flush to flush-interval and add test for jcmd and -XX:StartFlightRecording

! src/hotspot/share/jfr/dcmd/jfrDcmds.cpp
! src/hotspot/share/jfr/dcmd/jfrDcmds.hpp
! src/jdk.jfr/share/classes/jdk/jfr/Recording.java
! src/jdk.jfr/share/classes/jdk/jfr/consumer/UseCasesStream.java
+ test/jdk/jdk/jfr/jcmd/TestJcmdStartFlushInterval.java
+ test/jdk/jdk/jfr/startupargs/TestFlushInterval.java