RFR(S): 8218941: jdb should support a dbgtrace command that acts the same as the dbgtrace command line option

[Chris Plummer]

Hi,

Please review the following:

http://cr.openjdk.java.net/~cjplummer/8218941/webrev
https://bugs.openjdk.java.net/browse/JDK-8218941

Tested by running the following on all supported platforms:

open/test/hotspot/jtreg/vmTestbase/nsk/jdb
open/test/jdk/com/sun/jdi

thanks,

Chris