Fix 'tox -e genconfig' warnings

[Victoria Martinez de la Cruz]

Running tox -e genconfig to generate Zaqar configuration files outputs the following

ubuntu@trusty:~/zaqar$ sudo tox -e genconfig
genconfig create: /home/ubuntu/zaqar/.tox/genconfig
genconfig installdeps: -r/home/ubuntu/zaqar/requirements.txt, -r/home/ubuntu/zaqar/test-requirements.txt
genconfig develop-inst: /home/ubuntu/zaqar
genconfig runtests: commands[0] | oslo-config-generator --config-file etc/oslo-config-generator/zaqar.conf
WARNING:oslo_config.generator:"default_message_ttl" is missing a help string
WARNING:oslo_config.generator:"default_claim_ttl" is missing a help string
WARNING:oslo_config.generator:"default_claim_grace" is missing a help string
WARNING:oslo_config.generator:"max_queues_per_page" is missing a help string
WARNING:oslo_config.generator:"max_messages_per_page" is missing a help string
WARNING:oslo_config.generator:"max_queue_metadata" is missing a help string
WARNING:oslo_config.generator:"max_messages_post_size" is missing a help string
WARNING:oslo_config.generator:"max_message_ttl" is missing a help string
WARNING:oslo_config.generator:"max_claim_ttl" is missing a help string
WARNING:oslo_config.generator:"max_claim_grace" is missing a help string

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/163168

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/163168
Committed: https://git.openstack.org/cgit/openstack/zaqar/commit/?id=0bd34cb0b4cace6c7023f39bdf0838285866d987
Submitter: Jenkins
Branch: master

commit 0bd34cb0b4cace6c7023f39bdf0838285866d987
Author: ossanna16 <email address hidden>
Date: Tue Mar 10 20:27:12 2015 +0000

    This change adds missing help strings for claims

    This change adds missing help strings for some of the configurations available,
    including default_message_ttl, default_claim_ttl, default_claim_grace,
    max_queues_per_page, max_messages_per_page, max_queue_metadata,
    max_messages_post_size, max_message_ttl, max_claim_ttl and max_claim_grace

    Closes-Bug: #1429401

    Change-Id: Ic0440ad560effde6545828e5de3f4b8f59f756c9