fix(packer): Fix spot pricing flags (spinnaker#310) (spinnaker#311)

Packer 1.3 now enforces that aws_spot_price_auto_product can only
be passed if aws_spot_price is set to "auto". The default settings
that ship with Spinnaker set aws_spot_price to "0" and
aws_spot_price_auto_product non-null. Gate passing through the
product value so that it is only passed through if the spot price
is "auto".

chore(dependencies): Autobump spinnaker-dependencies (spinnaker#307) (s…

…pinnaker#308)

fix(bakery/oracle): private key passphrase is optional (spinnaker#302)

chore(dependencies): Autobump spinnaker-dependencies (spinnaker#289)

chore(builds): Reformat spinnaker deps version (spinnaker#280)

feat(bake/windows): Allow Chocolatey version control via attributes (s…

…pinnaker#277)

The current Chocolatey scripts always use the latest version, meaning
that bugs in new releases of Chocolatey may affect Windows bakes. This
pull allows a "chocolateyVersion" attribute to be applied to a bake step
to manually control the version installed by the scripts.

Default behavior is unchanged, it will install the latest version.

fix(bake/chocolatey): Observe Chocolatey exit codes (spinnaker#276)

Currently, when installing multiple packages, all are installs are attempted and only the final exit code is used (it falls through to Packer scripts in $LastExitCode).  Instead, exit with the same exit code as soon as the first package install fails.

chore(packer): upgrade packer binary to 1.2.2 (spinnaker#271) (spinna…

…ker#272)

fix(install_packages): support for multiple repos (spinnaker#267)

fix(install_packages): support for multiple repos (spinnaker#268)