RUBY-530 Kerberos support on JRuby
RUBY-530 Support for GSSAPI in URI parser
RUBY-530 More tests - unit, replica set, threading
RUBY-530 Use the socket to get hostname
RUBY-530 Refer to config file as JAAS_LOGIN_CONFIG_FILE
RUBY-530 Update extra options name in auth module
RUBY-530 Don't require a config file in gssapi test
RUBY-530 Keep realm and host as different env variables in gssapi test