Change to use pip3

[chrislovecnm]

This changes "pip" to "pip3" in make.sh.

On systems that have both python2 and python3 installed, we may want to use
a call to pip3 for installing modules, rather than just pip.

On my mac, it was not happy as I have both pip and pip3 installed.

[chrislovecnm]

This seems to be causing failures with other CI runs as well https://concourse.infra.cft.tips/builds/4751

[chrislovecnm]

This failed because I think this:

       1 error(s) occurred:
       
       * module.example.module.gke.google_container_cluster.zonal_primary: 1 error(s) occurred:
       
       * google_container_cluster.zonal_primary: googleapi: Error 400: Master version "1.13.6-gke.13" is unsupported., badRequest
       
       Terraform does not automatically rollback in the face of errors.
       Instead, your Terraform state file has been partially updated with
       any resources that successfully completed. Please address the error
       above and apply again to incrementally change your infrastructure.
       
       
>>>>>> ------Exception-------
>>>>>> Class: Kitchen::ActionFailed
>>>>>> Message: 1 actions failed.
>>>>>>     Converge failed on instance <node-pool-local>.  Please see .kitchen/logs/node-pool-local.log for more details
>>>>>> ----------------------
>>>>>> Please see .kitchen/logs/kitchen.log for more details
>>>>>> Also try running `kitchen diagnose --all` for configuration

[chrislovecnm]

Actually the CI issue appears to be:

       * google_container_cluster.zonal_primary: googleapi: Error 400: Master version "1.13.6-gke.13" is unsupported., badRequest

[morgante]

Yeah looks like we need to change our default master version.