gRPC integration tests can't start minikube on Travis

[ignasi35]

++curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt
+curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/v1.20.4/bin/linux/amd64/kubectl
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 38.3M  100 38.3M    0     0   136M      0 --:--:-- --:--:-- --:--:--  136M
+chmod +x kubectl
+sudo cp kubectl /usr/local/bin/
+rm kubectl
+export MINIKUBE_WANTUPDATENOTIFICATION=false
+MINIKUBE_WANTUPDATENOTIFICATION=false
+export MINIKUBE_WANTREPORTERRORPROMPT=false
+MINIKUBE_WANTREPORTERRORPROMPT=false
+export MINIKUBE_HOME=/home/travis
+MINIKUBE_HOME=/home/travis
+export CHANGE_MINIKUBE_NONE_USER=true
+CHANGE_MINIKUBE_NONE_USER=true
+mkdir -p /home/travis/.kube
+touch /home/travis/.kube/config
+export KUBECONFIG=/home/travis/.kube/config
+KUBECONFIG=/home/travis/.kube/config
+minikube start --driver=docker
* minikube v1.17.1 on Ubuntu 16.04 (amd64)
  - KUBECONFIG=/home/travis/.kube/config
  - MINIKUBE_WANTREPORTERRORPROMPT=false
  - MINIKUBE_WANTUPDATENOTIFICATION=false
  - MINIKUBE_HOME=/home/travis
* Using the docker driver based on user configuration
* Starting control plane node minikube in cluster minikube
* Pulling base image ...
* Downloading Kubernetes v1.20.2 preload ...
    > preloaded-images-k8s-v8-v1....: 491.22 MiB / 491.22 MiB  100.00% 134.95 M
* Creating docker container (CPUs=2, Memory=2200MB) ...
* Preparing Kubernetes v1.20.2 on Docker 20.10.2 .../ E0301 14:29:00.169406    5244 start.go:99] Unable to get host IP: network inspect: docker network inspect minikube --format "{"Name": "{{.Name}}","Driver": "{{.Driver}}","Subnet": "{{range .IPAM.Config}}{{.Subnet}}{{end}}","Gateway": "{{range .IPAM.Config}}{{.Gateway}}{{end}}","MTU": {{if (index .Options "com.docker.network.driver.mtu")}}{{(index .Options "com.docker.network.driver.mtu")}}{{else}}0{{end}},{{$first := true}} "ContainerIPs": [{{range $k,$v := .Containers }}{{if $first}}{{$first = false}}{{else}}, {{end}}"{{$v.IPv4Address}}"{{end}}]}": exit status 64
stdout:
stderr:
Template parsing error: template: :1: unexpected "=" in operand
E0301 14:29:00.170455    5244 out.go:330] unable to execute Failed to setup kubeconfig: network inspect: docker network inspect minikube --format "{"Name": "{{.Name}}","Driver": "{{.Driver}}","Subnet": "{{range .IPAM.Config}}{{.Subnet}}{{end}}","Gateway": "{{range .IPAM.Config}}{{.Gateway}}{{end}}","MTU": {{if (index .Options "com.docker.network.driver.mtu")}}{{(index .Options "com.docker.network.driver.mtu")}}{{else}}0{{end}},{{$first := true}} "ContainerIPs": [{{range $k,$v := .Containers }}{{if $first}}{{$first = false}}{{else}}, {{end}}"{{$v.IPv4Address}}"{{end}}]}": exit status 64
stdout:
stderr:
Template parsing error: template: :1: unexpected "=" in operand
: template: Failed to setup kubeconfig: network inspect: docker network inspect minikube --format "{"Name": "{{.Name}}","Driver": "{{.Driver}}","Subnet": "{{range .IPAM.Config}}{{.Subnet}}{{end}}","Gateway": "{{range .IPAM.Config}}{{.Gateway}}{{end}}","MTU": {{if (index .Options "com.docker.network.driver.mtu")}}{{(index .Options "com.docker.network.driver.mtu")}}{{else}}0{{end}},{{$first := true}} "ContainerIPs": [{{range $k,$v := .Containers }}{{if $first}}{{$first = false}}{{else}}, {{end}}"{{$v.IPv4Address}}"{{end}}]}": exit status 64
stdout:
stderr:
Template parsing error: template: :1: unexpected "=" in operand
:1:253: executing "Failed to setup kubeconfig: network inspect: docker network inspect minikube --format \"{\"Name\": \"{{.Name}}\",\"Driver\": \"{{.Driver}}\",\"Subnet\": \"{{range .IPAM.Config}}{{.Subnet}}{{end}}\",\"Gateway\": \"{{range .IPAM.Config}}{{.Gateway}}{{end}}\",\"MTU\": {{if (index .Options \"com.docker.network.driver.mtu\")}}{{(index .Options \"com.docker.network.driver.mtu\")}}{{else}}0{{end}},{{$first := true}} \"ContainerIPs\": [{{range $k,$v := .Containers }}{{if $first}}{{$first = false}}{{else}}, {{end}}\"{{$v.IPv4Address}}\"{{end}}]}\": exit status 64\nstdout:\n\nstderr:\nTemplate parsing error: template: :1: unexpected \"=\" in operand\n" at <index .Options "com.docker.network.driver.mtu">: error calling index: index of untyped nil - returning raw string.

X Exiting due to GUEST_START: Failed to setup kubeconfig: network inspect: docker network inspect minikube --format "{"Name": "{{.Name}}","Driver": "{{.Driver}}","Subnet": "{{range .IPAM.Config}}{{.Subnet}}{{end}}","Gateway": "{{range .IPAM.Config}}{{.Gateway}}{{end}}","MTU": {{if (index .Options "com.docker.network.driver.mtu")}}{{(index .Options "com.docker.network.driver.mtu")}}{{else}}0{{end}},{{$first := true}} "ContainerIPs": [{{range $k,$v := .Containers }}{{if $first}}{{$first = false}}{{else}}, {{end}}"{{$v.IPv4Address}}"{{end}}]}": exit status 64
stdout:
stderr:
Template parsing error: template: :1: unexpected "=" in operand
* 
* If the above advice does not help, please let us know: 
  - https://github.com/kubernetes/minikube/issues/new/choose

[ignasi35]

This was fixed in https://github.com/akka/akka-sample-cluster-kubernetes-scala/pull/54/files so I copied the same approach in #195