[quota] add unittest for neutron_plugin_contrail.plugins.opencontrail.quota.driver.QuotaDriver.[ _get_quotas, get_all_quotas ]

Signed-off-by: Nicolas PLANEL <nicolas.planel@enovance.com>
Merge pull request #28 from nplanel/quota-dev

[quota] add unittest for neutron_plugin_contrail.plugins.opencontrail.qu...