Change "Openstack" to "OpenStack"
Change "Openstack" to "OpenStack"

According to the word choice convention in
http://docs.openstack.org/contributor-guide/writing-style/word-choice.html
We should use OpenStack instead of Openstack.

Change-Id: I1aff75b8ca5671b2e42b5993192eea59e2247a3e

openstack/zaqar-ui,openstack/zaqar-ui,openstack/zaqar-ui,openstack/zaqar-ui