Bugfix: Ensure update_server_array() is not called in Terminate actor Dry run.

Specifically, the execute() method was calling the update_server_array()
method regardless of dry mode. In tests this ran fine because we were
using mocks, but in reality this was making live changes to server
arrays. Bad!
Bump version to 0.1.1a3
Whitespace cleanup
Merge pull request #93 from Nextdoor/fix_terminate_array_dry_mode

Bugfix: Ensure update_server_array() is not called in Terminate actor Dr...