Bug 574403 - Show process ID for process element in Debug view

Added process id to the process element label in the Debug view.

Change-Id: Id2c0e9a7b3240ce1b3a7a99689e07ca5bf0cf3eb
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.debug/+/189972
Tested-by: JDT Bot <jdt-bot@eclipse.org>
Tested-by: Sarika Sinha <sarika.sinha@in.ibm.com>
Reviewed-by: Sarika Sinha <sarika.sinha@in.ibm.com>