Updated openstack/openstack
Project: openstack/requirements  221b5c205a09b62a18a36c32c0e1da4d9b6287e3

Bump min saharaclient version

* 0.6.0 has been released about a half of year ago;
* there is a bunch of significant bug fixes and improvements since
  0.6.0;
* savanna aliases has been removed;
* requirements are up to date for Juno.

Change-Id: I2e4d618ad077a7950879087b47cccf82e8595ded