Revert "Add credentials to connection spec'"
Revert "Add credentials to connection spec'"

This reverts commit 0bd75c5c28a5660f7d8829ca732cbd39729299a8.

mongodb/mongo-ruby-driver,agis-/mongo-ruby-driver,kay-kim/mongo-ruby-driver,tommyb67/mongo-ruby-driver,fairplace/mongo-ruby-driver,brandonblack/mongo-ruby-driver,AndyObtiva/mongo-ruby-driver,jonhyman/mongo-ruby-driver,saghm/mongo-ruby-driver,jonhyman/mongo-ruby-driver,wandenberg/mongo-ruby-driver,saghm/mongo-ruby-driver,namusyaka/mongo-ruby-driver,aherlihy/mongo-ruby-driver,ShanaLMoore/mongo-ruby-driver,xronos-i-am/mongo-ruby-driver,fhwang/mongo-ruby-driver,estolfo/mongo-ruby-driver,mongodb/mongo-ruby-driver,kay-kim/mongo-ruby-driver,mongodb/mongo-ruby-driver,0x00evil/mongo-ruby-driver,estolfo/mongo-ruby-driver