Changes

* vps-create: fix checking needed disk space ({{B|2413}})

* vzctl set --mount_opts: fix a segfault ({{B|2385}})

* suse-add_ip.sh: only set default route to venet0 if there is no other ({{B|2376}})

* set_userpass.sh: fix bashism ({{B|2403}})

* vzctl snapshot*: improve --id parameter parsing (validate, curly brackets are optional)

* vzctl umount: handle the case when CT have deleted mount points

* vzctl restore: do not print "Starting container"

* vzctl restore: print 'restore failed' not 'start failed'