Dataloader import

[stepanstipl]

Original PR was GPII#696 and we agreed to combine the efforts via @klown's branch here and PR GPII#692 to universal

--- original PR text ---

This PR moves dataloader from original gpii-ops/gpii-dataloader repo into universal.

Main reasons behind this:

• Get rid of the duplication of Dockerfile and necessity to maintain extra image and pipeline
• Get rid of cloning the repo and installing npm modules when the container is executed (this would be slow, is prone to errors and would raise question of versioning)
• Data loader will always have the new universal code (as it will be running in the universal image)
• Data loader will get triggered every time there's a change to universal (as the universal image will get updated)

Most of the code was in universal already, and gpii-ops/gpii-dataloader contained basically only shell wrapper and the docker image. Work on new dataloader (GPII-3138 and GPII#626) requires changes to the existing dataloader wrapper and therefore presented a good opportunity for the move.

This is a continuation of gpii-ops/gpii-dataloader#6 PR.

Main changes:

• Import deleteAndLoadSnapsets.sh and DataLoader.md
• Add dataLoader dependencies to docker image (jq and curl)
• Update data loader script to reflect new location in universal
• Minor formatting changes
• Add DB connectivity check to dataloader
• Update vagrantCloudBasedContainers.sh to work with new dl location
• Update DataLoader docs to reflect current state

I have tested this locally and plan to create corresponding PR and test for gpii-infra changes required.