Classic to Application Load Balancer migration

[heronrs]

Implementation for migrating the rack API Classic Load Balancer to an Application Load Balancer.

• cloudformation changes
• new cli command convox rack sync to retrieve the new rack API URL

It's important to note that with the ELB migration, the rack API hostname will change. The switch between hostname will be transparent for console managed racks. For users running racks outside of the console, we provide the convox rack sync --name rack-name command that should be executed after the update. This will print the new hostname to stdout.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@227ad41). Click here to learn what that means. Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3543   +/-   ##
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  Coverage          ?   36.14%           
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  Files             ?      168           
  Lines             ?    18461           
  Branches          ?        0           
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  Hits              ?     6672           
  Misses            ?    10656           
  Partials          ?     1133           

Impacted Files	Coverage Δ
pkg/cli/rack.go	66.90% <100.00%> (ø)

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