missing jsonnet-lib dependencies

[agrahamlincoln]

While following the instructions on the README, I noticed that a few jsonnet libs are missing. Fortunately they are available in https://github.com/grafana/jsonnet-libs

I was able to workaround the issue by running the following after installing the other dependencies.

jb install https://github.com/grafana/jsonnet-libs/ksonnet-util
jb install https://github.com/grafana/jsonnet-libs/consul
jb install https://github.com/grafana/jsonnet-libs/memcached
jb install https://github.com/grafana/jsonnet-libs/etcd-operator