bug #2487: Always use the current system ds when resuming

(cherry picked from commit bc98a3fa0237193e4854a4315bc349c3f9db3f1f)

Conflicts:
	src/rm/RequestManagerVirtualMachine.cc
bug #2481: Check read permissions in downloader.sh

(cherry picked from commit 682f24bafda95106271d434bb71258cdd89cc1f8)
bug #2492: Host rename requires ADMIN rights

(cherry picked from commit 9eba97912c1ea93c56b62e3f75258e5bf53e4e26)
Bug #2471: Update log messages that refer to deprecated actions

(cherry picked from commit 444e729f03ca6d70f0a8de33bf2968e835cb4a8f)
Bug #2386: Better log backup for one start

Backup all log files with mv, move the backups from start() into start_one() and start_sched(), and expose the fact that the *_sched commands are supported

(cherry picked from commit c1d3f62543a0df3bd04658d7b4672f1345e8abec)