[user] Create contrail user/conf/log dir on all nodes

Analytics compute and control nodes can be installed on another node
than config (api*) node, so we must install contrail user and logs.
https://github.com/Juniper/contrail-controller/wiki/Roles-Daemons-Ports

Change-Id: I58faf3f4c76b2eb2077552036a239b60103ee965
[user] Don't override unix-rights for configuration file

Fix according commit cdd4705da4c06692e3fbae0976d343e46363214b
config file are rw-r--r-- (in octale 644) by default.

Change-Id: Iab887df029af31f361a6c56ec49931808d1aa464
Merge pull request #44 from sbadia/user-contrail

 [user] Create contrail user/conf/log dir on all nodes