Not clear which DB backups are being created on destroy

[brandonkelly]

When the destroy command is backing up the databases, it’s not clear which database is currently getting backed up:

For example you end up staring at something like this for a while:

Created backup "all-dbs-200520_113700.sql", downloading...

and it’s not clear which database that was until the filename is finally written out once it’s done:

Backup completed and stored in "/Users/brandon/.nitro/backups/nitro-dev/mysql_5.7_3306/all-dbs-200520_113700.sql"

I think that initial status line should be replaced with:

Backing up all databases from MySQL 5.7 (port 3306) ... done
Downloading backup ... done
Backup saved to /Users/brandon/.nitro/backups/nitro-dev/mysql_5.7_3306/all-dbs-200520_113700.sql

(Even if it’s quick, i think it’s worth outputting that first line (sans-done message) while the backup is being initially created within the VM.)