CXX-436 Backport server 2.8.0-rc0..2.8.0-rc1 changes
CXX-437 Backport server 2.8.0-rc1..2.8.0-rc2 changes
CXX-438 Provide implicit authMechanism and source
CXX-395 example args specify uri instead of port
CXX-440 Fix tests for 2.2