Update blazar installation guide

[Masahito Muroi]

Revise installation section in blazar's documentation up-to-date. The docs are placed under doc/source.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/435255
Committed: https://git.openstack.org/cgit/openstack/blazar/commit/?id=d6665d36834584121971b66214e4e61d1caf3ea0
Submitter: Jenkins
Branch: master

commit d6665d36834584121971b66214e4e61d1caf3ea0
Author: Tejaswi Bachu <email address hidden>
Date: Fri Feb 17 11:28:12 2017 +0530

    Add more precise DevStack installation instructions

    Change-Id: Id57181195d44bbc3c2a14b095e4c16d5e79aeb2d
    Partial-Bug: #1662740

[Hiroaki Kobayashi (hiro-kobayashi)]

https://review.openstack.org/#/c/437004/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/437004
Committed: https://git.openstack.org/cgit/openstack/blazar/commit/?id=526353a440ecf502c7c32113ca4f40de010b87ba
Submitter: Jenkins
Branch: master

commit 526353a440ecf502c7c32113ca4f40de010b87ba
Author: Hiroaki Kobayashi <email address hidden>
Date: Thu Feb 23 00:40:30 2017 +0900

    Update the guide for installation without DevStack

    Change-Id: I5d11acc6731c08e84d3d4941663cafcead95c508
    Partial-Bug: #1662740

[Masahito Muroi (muroi-masahito)]

All patches related to install guide are merged.