provide extra information for restore operation

[vdelendik]

during ./zebrunner.sh restore let's provide extra information about backup date of each sub-component.
For now we only warn that data might be lost. It will be useful to show backup generation date for each sub-component so administrator ensure he restore the system to that dates

[vdelendik]

fixed adding 2 modifications:

1. if you run ./zebrunner.sh restore with backup you should see warning and exit:

You have to backup something in advance using: ./zebrunner.sh backup
For more help join telegram channel: https://t.me/zebrunner

2. when you already have a backup we show not datetime state when your backup was done and message should be:

Your services will be stopped and current data might be lost.
Do you want to do a restore to "Thu Jul 21 13:50:53 UTC 2022" state? y/n [n]:

where date is calculated based on backup/settings.env.bak file only

[ghost]

Verified, for case 2 I got old message, need fix.

[ghost]

2 case was tested with wrong command, after re-verification with ./zebrunner.sh restore it works fine

[vdelendik]

closed based on latest comment