RUBY-744 Support Unix domain socket path in URI
RUBY-744 Require exactly one unix domain sock path or host-port pairs
Merge pull request #509 from estolfo/RUBY-744-unix-sock

RUBY-744 Support Unix domain socket path in URI
RUBY-733 Only run auth tests if auth is enabled
Merge pull request #513 from estolfo/RUBY-733-auth-enabled

RUBY-733 Only run auth tests if auth is enabled
RUBY-831 Catch OperationTimeout in client#active?
RUBY-831 Add default op timeout to MongoClient
RUBY-831 Update pool test to account for default op timeout on client