[opencontrail] Use suggests instead of depends for cassandra, zookeeper and redis-server

Relax dependency in order to be able to install cassandra, zookeeper and
redis-server on another servers than contrail srv.
[services] Finish renaming and clean services
Merge pull request #17 from sbadia/rename

[services] Finish renaming and clean services
Merge pull request #16 from sbadia/suggests

[opencontrail] Use suggests instead of depends for cassandra, zookeeper and redis-server
d/control: Fix not-binnmuable-any-depends-any

The package is not safely binNMUable because an arch:any package depends
on another arch:any package with a (= ${source:Version}) relationship.

(cherry-pick from commit 5b184a076566242b21ebd539d5503fff990b5380)
maintainer-script-needs-depends-on-adduser

cherry-pick from commit e9ef14222dc5849db9a3f280a1e6dcc50057c5bc