Wrong spells and description of functions in multiple files

[venkatamahesh]

1.) https://github.com/openstack/rally/blob/master/rally/plugins/openstack/scenarios/ceilometer/utils.py
           Line 254 name => unit
           Line 255 name => volume

2.) https://github.com/openstack/rally/blob/master/rally/plugins/openstack/scenarios/ceilometer/traits.py
         Line 35 and 53 missing "Create user" in description line

3.) https://github.com/openstack/rally/blob/master/rally/plugins/openstack/scenarios/ceilometer/queries.py
        Line 84 name => unit
       Line 85 name => volume

4.) https://github.com/openstack/rally/blob/master/rally/plugins/openstack/scenarios/ceilometer/events.py
         Line 35 , 49 , 63 missing "Create user" in description line

5.) https://github.com/openstack/rally/blob/master/rally/deployment/serverprovider/provider.py
         Line 150 Indetificator ==> Identificator

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/218830

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/218830
Committed: https://git.openstack.org/cgit/openstack/rally/commit/?id=b78b3799c33ebc016fb4326243880fa46e380aa8
Submitter: Jenkins
Branch: master

commit b78b3799c33ebc016fb4326243880fa46e380aa8
Author: venkatamahesh <email address hidden>
Date: Mon Aug 31 17:56:38 2015 +0530

    Fixed description sentences of functions

    description of functions are corrected and
    spell of identificator and parameter of functions
    are corrected

    Change-Id: I1edd25fd0506996550223ced3d8085e421c82f1b
    Closes-Bug: #1490360