Use replicaSet param in mongodb-uri

[HadiLatifi]

Replicaset param is required when using internal mongodb with more than one replica.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[debdutdeb]

@HadiLatifi please sign the CLA :^)

[prppedro]

@HadiLatifi, as @debdutdeb pointed out, you need to sign CLA in order to allow us merging your PR.