heartbeat/syslog-ng: additional parameters introduced

• introduced resource parameters
  • control_file
  • persist_file
  • pidfile
• normally these would have to be added to START_OPTS, but now they have their own parameters
• added these in a backwards compatible way:
  • they are not mandatory
  • they have blank defaults
  • if they aren't specified, they don't show up at the command line at all

Signed-off-by: Janos SZIGETVARI <jszigetvari@gmail.com>