feat(buildtool): Can produce changelog relative to bom

docs(tests/Readme): updated link for bake_and_deploy_test.py test scr…

…ipt (spinnaker#2882)

Release 1.7.x cherry pick modernize hal validation changed bom use im…

…age project (spinnaker#2723)

* fix(buildtool): Use image project from BOM (spinnaker#2675)

* chore(buildtool): Changed BOM audit detail. (spinnaker#2676)

* Changed output format for invalid bom output file
* Emit explicitly confirmed / invalid releases

* chore(validate): Modernized halyard validation restart

Halyard no longer uses upstart.

chore(validate): Deploy kayenta

fix(buildtool): Publish release bom to halyard

Fix version numbering (spinnaker#2623)

* fix(validate): Fixed typo (spinnaker#2622)

* fix(buildtool): Fixed version number when tags are in branches

refactor(vm_component_images): Refactor vm image orchestration. (spin…

…naker#2234)

fix(build_release): Always avoid running html gen tests in Orca. (spi…

…nnaker#2202)

chore(buildtool): Asynchronous subprocesses and more logging.

fix(testing): Fixed az agent constructor call.