Invalid MBR ID passed to isohybrid

Originally created by @intrigeri on #12453 (Redmine)

Symptoms: #11983 (comment 48288). Once I’ve made isohybrid more verbose I saw “isohybrid: invalid id: `’1490015021’’”. So passing --id $SOURCE_DATE_EPOCH to isohybrid made the ISO reproducible… because it’s an invalid ID and so we stopped hybriding the ISO.

Feature Branch: feature/5630-deterministic-builds

Parent Task: #5630 (closed)

Edited May 15, 2020 by intrigeri

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