A ZeroDivisionError is Thrown Without Servers

[Ron Rickard]

When no servers are defined in the server pool, a ZeroDivisionError is thrown. Instead, a better error describing the situation (no servers defined) should occur.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/145418

[OpenStack Infra (hudson-openstack)]

Change abandoned by Ron Rickard (<email address hidden>) on branch: master
Review: https://review.openstack.org/145418
Reason: Will resubmit a working patch.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/147886

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/147886
Committed: https://git.openstack.org/cgit/openstack/designate/commit/?id=73a9703f080db88437012a529ed744a872e2172a
Submitter: Jenkins
Branch: master

commit 73a9703f080db88437012a529ed744a872e2172a
Author: rjrjr <email address hidden>
Date: Fri Jan 16 08:29:14 2015 -0700

    Pool Manager Throws An Error When No Servers are Defined

    Before when no pool servers were defined, Pool Manager would run and throw a
    ZeroDivisionError. Now, Pool Manager throws a NoPoolServersConfigured error
    and stops running.

    Change-Id: I534e1fc813b8bd35209acd2574a5b17e171c7de9
    Closes-Bug: 1403591