Added load checking on remote machine. If you have few machines which are
using the same server for backups, could be handy.

During early connect to backup destination, check for load is performed.
If it's over the limit, process sleeps for 5 minutes. This will happen 3
times, then script will continue with local run only. So we are not going
to miss backup schedule.

Based on the -i/-I parameter, this snapshots will be transferred to remote
system on next run.
forgot the change to local only snapshoting if remote still under high
load and we wasted too much time waiting.
fixes to 5b18718ce8d5ff5a2e66fe05bed8866e32583b8c
Merge pull request #2 from mk01/zevo

remote machine load checking