Changes for ostree:

• Allow using extra repos to get packages for composing OSTree repository (qwan)
• Capture all lorax logs from generating installer. (lsedlar)
• Allow adding versioning metadata. (qwan)
• New option to enable generating ostree summary file. (qwan)
• Use the write-commitid-to feature rather than parsing ostree logs. (puiterwijk)

Other improvements:

• Faster multilib blacklist processing in depsolving (dmach, lsedlar)
• Generating latest symlink can now be skipped. (qwan)
• A notification is sent when compose fails to start. (lsedlar)

Backport patches for ostree installer:

• Expose lorax's rootfs-size argument. (walters)
• use dvd-ostree type in metadata. (lsedlar)