Added migrator dependency on cluster_connection_properties

[ArtemiyFirsov]

Added migrator dependency on cluster_connection_properties of config object

This will allow customizing connection limits, and other properties of cluster connection through .yaml file

[ArtemiyFirsov]

not fully tested yet, once looking good, will create pull request

[loganlund]

Something like this would be a great addition to this package. Gives everyone more flexibility to configure their connections how they want them.