* Fixing issue 16090 where Grafana uses illegal characters in requests to Prometheus

* Rebase with Grafana and Merge branch 'master' of https://github.com/BhartiAgrawalNvidia/grafana into fix-16090

# Conflicts:
#	public/app/plugins/datasource/prometheus/language_provider.ts

* Rebase with Grafana and Merge branch 'master' of https://github.com/BhartiAgrawalNvidia/grafana into fix-16090

# Conflicts:
#	public/app/plugins/datasource/prometheus/language_provider.ts

* Use querystring to escape the url

Co-authored-by: Andrej Ocenas <mr.ocenas@gmail.com>
Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>