add appmesh addon

[M00nF1sh]

Add an AppMesh Addon.
which will configure node role iam permissions and will install AppMesh Controller/Injector from helm charts (we use it to test helm charts as well 🤣 )
configurable options:

• AWS_K8S_TESTER_EKS_ADD_ON_APP_MESH_ENABLE: true/false (whether enable this addOn)
• AWS_K8S_TESTER_EKS_ADD_ON_APP_MESH_NAMESPACE: ... (where to install controllers, defaults to appmesh-system)
• AWS_K8S_TESTER_EKS_ADD_ON_APP_MESH_CONTROLLER_IMAGE: imageRepo:imageTag (defaults the one in helm chart)
• AWS_K8S_TESTER_EKS_ADD_ON_APP_MESH_INJECTOR_IMAGE: imageRepo:imageTag (defaults the one in helm chart)

Test done:

rm -rf test-prod*
AWS_K8S_TESTER_EKS_REGION=us-west-2 \
AWS_K8S_TESTER_EKS_PARAMETERS_VERSION=1.14 \
AWS_K8S_TESTER_EKS_ADD_ON_MANAGED_NODE_GROUPS_ENABLE=true \
AWS_K8S_TESTER_EKS_ADD_ON_APP_MESH_ENABLE=true \
./bin/aws-k8s-tester-de1e65c500d1-darwin-amd64 eks create config -p test-prod.yaml && cat test-prod.yaml
./bin/aws-k8s-tester-de1e65c500d1-darwin-amd64 eks create cluster -p test-prod.yaml

./bin/aws-k8s-tester-de1e65c500d1-darwin-amd64 eks delete cluster -p test-prod.yaml

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[gyuho]

great :)

[M00nF1sh]

go modules is a hell..i wasted 1 hour try to add cli-runtime and make it compatible with others. 😄

[gyuho]

lgtm, thanks!