Create Manual Tooling for GKE Marketplace Release

• Remove all references to submodules and follow the upstream GitLab Cloud Native Chart instead of a special forked repository
• Create a wrapper chart for the Google GKE Marketplace named gitlab-mp allowing special configuration unique to the marketplace to be passed in without having to change the upstream chart
• Add env-doctor script allowing users to quickly verify that their environment is ready to produce a GKE Marketplace update
• Fortify supporting scripts to work when invoked from any path
• Remove deprecated scripts
• Move the Dockerfile definition and build context into the container directory and simplify it to use deployer_helm_tiller from Google Marketplace Tools
• Insert schema.yaml and requirements.yaml to the build context by copying templates rather than running substitutions on the originals
• Support RBAC entries inserted dynamically to the schema.yaml required by the Google Marketplace
• Add tooling to build the deployer container, push it and supporting containers to the marketplace, and test and tear down the latest deployer images
• Tooling is configurable via the environment to avoid the need to alter scripts during regular release cycles
• Updated documentation; moved original README to doc/installing and split documentation into user versus developer
• Update the .gitlab-ci file to use the new build scripts
• Add script to run Google Marketplace mpdev validation against the completed deployer image.

Resolves: https://gitlab.com/charts/gitlab/issues/1041

Signed-off-by: Robert Marshall rmarshall@gitlab.com