New component-mismatches for source universe -> main

[process-component-mismatches-diff]

The following universe packages have new reverse dependencies
in main or got seeded. They need to get a MainInclusionReport and be
promoted, or the reverse dependencies in main need to be dropped:

    MIR: #1520679 (Fix Committed)
  o ubuntu-snappy: golang-github-ubuntu-core-snappy-dev ubuntu-snappy ubuntu-snappy-cli
    [Reverse-Depends: Rescued from ubuntu-snappy, Ubuntu.Xenial system-image seed]
    MIR: #1552507 (Incomplete) [MIR/FFE] Promoting a11y-profile-manager to main.
    MIR: #1556703 (New)

Please see http://people.canonical.com/~ubuntu-archive/component-mismatches.txt
for the full report.

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