removed helm entry in scrape_config.sh because there doesn't seem to be anyway to make it work with new pipeline config

renaming `metric` stage to `metrics` as it defines multiple metrics, similar to labels stage which is also plural.
Adding a couple unit tests to regex and json stage to act as examples

cleaning up GoDoc
pipeline_name is now optional for matcher stage

refactored and improved some of the tests, each stage type should now have a test using actual YAML
A few TODO's remaining and some comment cleanup

metric test is still failing because of missing metrics when the counter is 0
added a lot of TODO's I need to go back and cleanup

Making the pipeline itself a Stage so that we can use it to better implement the Match stage (and it cleans up the Docker and CRI extensions some too)
Still needs to fix the metrics test

Still needs:  Matcher stage work, pipeline test work

* Reject entries based on age set in limits

Signed-off-by: Steven Sheehy <ssheehy@firescope.com>

* loki chart deployment.yaml: Only set JAEGER_AGENT_HOST if set.

* docs/troubleshooting.md: Fixed variable name for chart option.

* Bumped loki chart version for variable fix.

Mentioned in title. To save new beginner's time, provide one config example for use Cassandra as Index Storage.

* ksonnet changes for running loki in single bianry
Added retention config with default values

* Fixed indentation

* Update cortex vendor
Use query max look back from cortex
Update config changes from cortex
Fixed breaking code due to updating cortex vendor

* fixed linter error

* add a dev target to deploy the current image in k8s

* impr/clients: Handle TLS config and MTLS for logcli and promtail (#540)

* impr/clients: Handle TLS config and MTLS for logcli and promtail

* fix/tls: Please gofmt...

* impr/clients: use prometheus HTTPClientConfig for logcli and promtail

* fix/promtail: Set proper Client config name

* impr/promtail: Use prometheus HTTPClientConfig configuration

* adapt with master

* address review

* fix conflicts

* address requested changes

* remove file

* add helm dev targets

* adding back assets

* fix review comments

* Review feedback

Also bumping lok-stack version which needs to be done if the loki or promtail chart versions are changed (#612)