[pve-devel] PVE Replica Email notification on failure.

[Wolfgang Link]

Now you get a email if a replication job fail.
The mail is only send the first time, when a job switched from 'ok' state in 'error' state.
No more notification will come when a job with error state retry to sync.

[PATCH manager V2]
Indentation cleanup.
Small clenup like W.Bumiller has suggested.

[PATCH manager V3]
Remove eval like D.Maurer has suggested.

[PATCH manager V4]
Rebase to current code base.
Remove eval like W.Bumiller has suggested.