Simplify the getting started instructions by avoiding directories requiring sudo/root.

[Eric Larson]

The Development Environment on Ubuntu [1] uses directories in `/var` for checking out the repo, keeping logs and maintaining some state in lib. As `/var` is typically not writable by a user, it would be helpful to describe the process from the standpoint of a user logged into the machine normally.

[1] http://docs.openstack.org/developer/designate/install/ubuntu-dev.html

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/157467

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/157510

[OpenStack Infra (hudson-openstack)]

Change abandoned by Eric Larson (<email address hidden>) on branch: master
Review: https://review.openstack.org/157510
Reason: I mistakenly changed the Change id in the commit.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/157467
Committed: https://git.openstack.org/cgit/openstack/designate/commit/?id=9b8ab565fa8f403e9cd137f9f976ca475bdc593b
Submitter: Jenkins
Branch: master

commit 9b8ab565fa8f403e9cd137f9f976ca475bdc593b
Author: Eric Larson <email address hidden>
Date: Thu Feb 19 12:01:41 2015 -0600

    Assume a new developer won't create a "designate" user in the dev guide

    The getting started docs suggest checking the code out into `/var/lib`,
    but this requires a later step of adding a `designate` user to the
    sudoers list without adding a step of adding the `designate` user in the
    first place.

    This updates the docs and basic config example to simply check out the
    code into `$HOME/openstack/designate/` and removes sudoers step.

    Closes-Bug: 1423628
    Change-Id: Ia30b5460532589417a7e8b1fad9c233ced954106