Fix kube-libsonnet import issues

• Fix #837 by importing kube-libsonnet manifests straight from vendor
  instead of lib symlink
• Minor Jenkinsfile fixes

Installation

Follow the installation guide to install the Bitnami Kubernetes Production Runtime (BKPR) on your cluster.

Supported Platforms

• Azure Kubernetes Service (AKS)
• Google Kubernetes Engine (GKE)
• Amazon Elastic Container Service for Kubernetes (EKS)
• BKPR on Generic Kubernetes Cluster (experimental)

Migration Guide

• BKPR v1.4 Migration Guide

Breaking Changes in Components

• Kibana 6.7 index (BKPR 1.3) format is not compatible with Kibana 7.5

Changelog

• add Bitnami SREs to MAINTAINERS (#771) - @jjo
• remove sameersbn from reviewer to automated pull requests (#750) - @sameersbn
• adds link to generic quickstart guide to release notes (#749) - @sameersbn