A bunch of resmoke hooks (but probably not only hooks) are not able to connect to the node in BF-20010. Some particular lines where it fails, but most likely not the full list:
https://github.com/10gen/mongo/blob/aabc1a93d2167a4ac5b60adc4cc733a45f4625e4/jstests/hooks/run_validate_collections_background.js#L60
https://github.com/10gen/mongo/blob/1c0abd198776e4da356ff1483ce444e762a012fd/jstests/hooks/run_dbcheck_background.js#L32
https://github.com/10gen/mongo/blob/89dd69676156c78fde985f0105b82a9b32db0dc7/jstests/hooks/validate_collections.js#L138

Possible fixes:

1. Retry "new Mongo(...)" in case of connections errors
   • Globally - in these patches (1, 2) is a rough attempt to override it globally for the whole resmoke (similarly to https://github.com/10gen/mongo/blob/ea7c5c3d8fce4468b0590638b2b4c5b9dcd071a1/jstests/libs/override_methods/enable_grpc_on_connect.js), but some tests got failed
   • In particular places in resmoke hooks - this way tests won't fail, but this would require to fix it in multiple places, that would need to be identified
2. Increase the connection timeout for "new Mongo(...)"