Configuration format changes for some of the contrail software daemons

o control-node
o collector (vizd)
o dns
o query-engine
o vnswad (vrouter)

These daemons now take configuration in the standard .ini format.
Default configuration file is read off

/etc/contrail/control-node.conf
/etc/contrail/collector.conf
/etc/contrail/dns.conf
/etc/contrail/query-engine.conf
/etc/contrail/vrouter.conf

One can override the values from the config file through command line option
as well. e.g. --LOG.level=DEBUG, --DEFAULTS.hostip=1.2.3.4, etc.

Use --help to see various options available. Package also places the default
config file under /etc/contrail/.

When configuration changes are made, the process must be _restarted_ to
take effect.