PMM-3106: Be consistent and use MONGODB_URI everywhere.

[TinLe]

Be consistent in usage of env var MONGODB_URI. Currently, documentation say "MONGODB_URL", but code is looking for MONGODB_URI.

[CLAassistant]

All committers have signed the CLA.

[arvenil]

@smartinov
Could you also drop

 	uri := os.Getenv("MONGODB_URI")
 	if uri != "" {
		uriF = &uri
	}

for

uriF := &uri

https://github.com/percona/mongodb_exporter/blob/master/mongodb_exporter.go#L87-L90
?

[arvenil]

@rnovikovP Invalidates #113, you can read my review for explanation #113 (review)

[codecov]

Codecov Report

Merging #116 into master will not change coverage.
The diff coverage is 50%.

@@           Coverage Diff           @@
##           master     #116   +/-   ##
=======================================
  Coverage   28.92%   28.92%           
=======================================
  Files          42       42           
  Lines        2282     2282           
=======================================
  Hits          660      660           
  Misses       1584     1584           
  Partials       38       38

Impacted Files	Coverage Δ
mongodb_exporter.go	3.5% <50%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 76913b6...a28942b. Read the comment docs.

[rishtham]

hi,
Is there a way to hide the password in mongodb_url string as the password is appearing in string .
export MONGODB_URI=mongodb://mongodb_exporter:s3cr3tpassw0rd@localhost:27017
thanks,