RFR(S): jdk.jfr.jcmd.TestJcmdDumpLimited fails due to erronous processing of -XX:FlightRecorderOptions

[Markus Gronlund]

Greetings,

Please review the following change set:

Webrev: http://cr.openjdk.java.net/~mgronlun/8205906/webrev00/ 
Bug: https://bugs.openjdk.java.net/browse/JDK-8205906 

Summary:

Bug in processing "tail" pointer when "-XX:FlightRecorderOptions" was passed without a delimiter.
Also took the opportunity to make the support for starting multiple -XX:StartFlightRecordings a bit simpler to follow, based on feedback from Erik.

Thanks
Markus