Give priority to CLI args

[Flavio Percoco]

Currently, oslo.config gives priority to arguments present in the config file instead of giving it to CLI defined ones.

This behavior should be changed to something more natural, that is, give CLI parameters the priority over config files.

Pls, read the m-l thread for more details:

http://lists.openstack.org/pipermail/openstack-dev/2013-May/008551.html

[Davanum Srinivas (DIMS) (dims-v)]

Review is here https://review.openstack.org/#/c/28405/

[Mark McLoughlin (markmc)]

An implementation of the more obvious behaviour is here: https://review.openstack.org/29459

Basically, where a --config-file argument appears in the command line should determine the priority given to options set in the file

For example, if you have:

  --config-file foo.conf --blaa --config-file bar.conf

you want any value for 'blaa' in foo.conf to be overwritten by --blaa, but a value in bar.conf should overwrite --blaa

[Alan Pevec (apevec)]

https://review.openstack.org/29459 was merged, not sure why this wasn't propagated to LP, setting status manually

[Zhongyue Luo (zyluo)]

http://docs.openstack.org/developer/oslo.config/#a3