add imageID for updates

[mamclaughlin]

Description

Adds ImageID to BM and Instance updates

Related Issues

Checklist:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you linted your code locally prior to submission?
• Have you successfully ran tests with your changes locally?

[codecov]

Codecov Report

Merging #152 (740f8c0) into master (d1651c4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #152   +/-   ##
=======================================
  Coverage   59.68%   59.68%           
=======================================
  Files          23       23           
  Lines        1352     1352           
=======================================
  Hits          807      807           
  Misses        280      280           
  Partials      265      265           

Impacted Files	Coverage Δ
bare_metal_server.go	58.44% <ø> (ø)
instance.go	61.33% <ø> (ø)

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[ddymko]

looks good