[Merge] ~tobijk/livecd-rootfs/+git/livecd-rootfs:sru-bionic-bug-1837871 into livecd-rootfs:ubuntu/bionic

[Tobias Koch]

Tobias Koch has proposed merging ~tobijk/livecd-rootfs/+git/livecd-rootfs:sru-bionic-bug-1837871 into livecd-rootfs:ubuntu/bionic.

Commit message:
Add retry logic to snap-tool to make downloads more resilient
    
LP: #1837871

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1837871 in livecd-rootfs (Ubuntu): "Add retry logic to snap-tool to make downloads more resilient"
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1837871

For more details, see:
https://code.launchpad.net/~tobijk/livecd-rootfs/+git/livecd-rootfs/+merge/371795

This is a backport. There have been no problems over several weeks with this in ubuntu/master.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~tobijk/livecd-rootfs/+git/livecd-rootfs:sru-bionic-bug-1837871 into livecd-rootfs:ubuntu/bionic.
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