Allow elasticsearch authentication besides encoding credentials into url

[varac]

Currrently the only way of using credentials to authenticate against an elasticsearch instance is to encode the username+password in the url.
This is bad when run in CI, i.e. gitlab unfortunatly still doesn't support protection against leaking secret variables. URls including credentials leak quite easy.
A better way would be to use a config file or a .netrc file for credentials.

[ionelmc]

As a workaround you could set addopts=--benchmark-stotage=secretstuff in pytest.ini programmatically.

[varac]

@ionelmc This doesn't solve the problem because on success, pytest-benchmark will still reveal the url including the credentials:

...
Saved benchmark data to ['https://admin:PASSWORD@elasticsearch.example.org:9200'] to index benchmark as doctype benchmark

[ionelmc]

Ok then there are two problems here:

• loading creds from .netrc
• blanking the output (eg: Saved benchmark data to 'https://***:***@elasticsearch.example.org:9200' to index benchmark as doctype benchmark)

[varac]

I think latter would be the easiest to do, I'd also be fine with using .netrc as well.

[varac]

Well on a second thought I'd prefer the .netrc option because it seems cleaner and you don't need to think twice in the future of preventing cred leakage when refactoring/adding features.