Merge pull request #32 from m-a-hall/pdi4compatible

[PDI-10209] MongoDB output step cannot insert an incoming field specifie...
[PDI-10371] Mongo DB Output: Leaving "Write concern (w option)" blank should default to write concern 1, but actually defaults to 0. Limit for throwing exception when number of retries gets exceeded was hardcoded instead of using the user-specified value.
Merge branch 'pdi4compatible' of https://github.com/pentaho/pentaho-mongodb-plugin into pdi4compatible