update ceilometer install instructions

[gordon chung]

'messagingv2' should be used for enabling notifications via oslo.messaging. '*.openstack.common.*' is the backward-compatibility solution which will be deprecated eventually. oslo.messaging was adopted in icehouse/juno.

also, the swift middleware packaged in ceilometer is deprecated as of kilo cycle so we should update docs to include new location (ceilometermiddleware)

also, getstarted_telemetry doc poorly describes the functionality of ceilometer and does not list the appropriate services.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/juno
Review: https://review.openstack.org/161449

[OpenStack Infra (hudson-openstack)]

Change abandoned by gordon chung (<email address hidden>) on branch: stable/juno
Review: https://review.openstack.org/161449
Reason: see above.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/158778
Committed: https://git.openstack.org/cgit/openstack/openstack-manuals/commit/?id=530f6bfb8c8d412ddc24503bd908e624be33b24a
Submitter: Jenkins
Branch: master

commit 530f6bfb8c8d412ddc24503bd908e624be33b24a
Author: gordon chung <email address hidden>
Date: Tue Feb 24 11:08:32 2015 -0500

    update ceilometer install guide and external service configuration

    - change notification_driver option to use messagingv2.
    *.openstack.common.* is pre-icehouse option.
    - add note to configure swift metrics using new ceilometermiddleware
    - update telemetry get_started guide:
      - generalise supported functions
      - fix notification agent and collector service purpose

    Closes-Bug: #1425713
    Co-Authored-By: Matt Kassawara <email address hidden>
    backport: juno
    Change-Id: I90dff1b5c2a7dd2943cfa7ff25bb63c08eb7986d

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/juno
Review: https://review.openstack.org/164199

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/164199
Committed: https://git.openstack.org/cgit/openstack/openstack-manuals/commit/?id=19f8c69ecb6542d34695c50b422f5ed11294ebdc
Submitter: Jenkins
Branch: stable/juno

commit 19f8c69ecb6542d34695c50b422f5ed11294ebdc
Author: gordon chung <email address hidden>
Date: Tue Feb 24 11:08:32 2015 -0500

    update ceilometer install guide and external service configuration

    - change notification_driver option to use messagingv2.
    *.openstack.common.* is pre-icehouse option.
    - update telemetry get_started guide:
      - generalise supported functions
      - fix notification agent and collector service purpose
    - removes references to ceilometermiddleware in swift guide since
      it is a Kilo feature
    - removes references to TELEMETRY_SECRET as it is a Kilo change

    Closes-Bug: #1425713
    Co-Authored-By: Matt Kassawara <email address hidden>
    backport: juno
    Change-Id: I90dff1b5c2a7dd2943cfa7ff25bb63c08eb7986d

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/openstack-manuals 15.0.0 release.