Achieve compatibility with Apache Allura

[b1ron]

What should be done?

Update: I believe it might be possible to run their tests with some minor adjustments.

In order to initialize the database with test data we need to support the SCRAM-SHA-1 authentication mechanism as PyMongo connects using this mechanism by default it seems. However, PLAIN is supported as seen here.

Tasks

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1. Support SCRAM-SHA-1 authentication mechanism #2012
   area/auth code/feature not ready +3
   
2. Support basic indexes #78
   4 of 4
   code/feature +1
3. Support $addToSet array update operator #825
   code/feature +1
   
4. Implement $sort aggregation pipeline stage #1439
   code/feature +1
   
5. Implement createUser command #1491
   area/auth code/feature +2
   
6. Implement the $sum aggregation operator #2013
   code/feature +1
   
7. Implement $year aggregation operator #2026
   area/aggregations code/feature not ready +3
   
8. Implement $month aggregation operator #2027
   area/aggregations code/feature not ready +3
   
9. Implement $dayOfMonth aggregation operator #2028
   area/aggregations code/feature not ready +3
   
10. Implement $match aggregation pipeline stage #1428
    code/feature +1