Identify rrd and syslog datasets with the hostname

Ticket:	#6127
Allow an optional suffix to swtich from

Ticket:	#6127
Rename system datasets when hostname changes

Ticket:	#6127
Catch up change in the dataset name for rrd and syslog

Ticket:	#6127
Start and stop syslog/collectd before system dataset rename

Ticket:	#6127