Packaging fixes:
1. Centos/RPM - Move adduser to %pre since some files are being
   installed with contrail user/group and RPM falls back to
   using root if contrail user/group is not found. Create
   directories before attempting to chown them in %post to
   prevent it from exiting without setting authbind port.
2. Debian - Create directories before attempting to chown
   them in postinst.

Closes-Bug: #1362340
Change-Id: Ibd062022762216e7ba5e8e59a52e1159ea13896e