Identify rrd and syslog datasets with the hostname

Ticket:	#6127
(cherry picked from commit c2b8410a70e32b2a41a9da8e041d8a21ae2d447a)
Allow an optional suffix to swtich from

Ticket:	#6127
(cherry picked from commit 269ef46880dd414bfbc8688fff10e18af81873d6)
Catch up change in the dataset name for rrd and syslog

Ticket:	#6127
(cherry picked from commit d087b00a0f5aa0413def657449adca1de01f61b0)
Start and stop syslog/collectd before system dataset rename

Ticket:	#6127
(cherry picked from commit 378a7e31af0bae8788f6123e51f59f9a6cc28145)
Use UUID4 instead of hostname for the rrd and syslog datasets

(cherry picked from commit 526187ecba7b038371b9abe3173d9fb763c025fa)

Conflicts:
	gui/system/models.py
Use UUID from the database to use in rrd/syslog rc scripts

Ticket:	#6127
(cherry picked from commit db21609a6b8a4058e1cdd101b6e92bcb699fe907)