Added rjil::zookeeper

Added contrail dependency zookeeper.
Added security banner on server logins

Added content to sync to /etc/issue or /etc/issue.net.
Configured SSH server to print banner.
Added unit tests for rjil::system.
Added redis as contrail dependency
Merge pull request #63 from hkumarmk/contrail_redis

Added redis as contrail dependency
Merge pull request #60 from hkumarmk/contrail_zookeeper

Added rjil::zookeeper
Merge pull request #61 from hkumarmk/added_banner

Added security banner on server logins
Install modules in /usr/share rather than /etc
Merge pull request #65 from sorenh/master

Install modules in /usr/share rather than /etc
Added cassandra as dependency for contrail

This need parameter seeds which is an array of IP of all
cassandra servers - this is only required in case of mult-node
setup.

Note: service discovery may not be able to handle this scenario as this have
multi-node cross dependency (in initial phase).