Provide explicit task create and update value in controller tests
Provide explicit task create and update value in controller tests

Assign an explicit created_at and updated_at datetime value to task DB
fixtures, it be used to fixes race condition in TasksController test
cases.

Closes-Bug: #1274365

Change-Id: I9f13c7e0e97085faac15713342808722a6692178
Signed-off-by: Zhi Yan Liu <98cb9f7b35c45309ab1e4c4eac6ba314b641cf7a@cn.ibm.com>
stevelle/glance,saeki-masaki/glance,paramite/glance,JioCloud/glance,darren-wang/gl,openstack/glance,akash1808/glance,takeshineshiro/glance,rajalokan/glance,paramite/glance,wkoathp/glance,jumpstarter-io/glance,darren-wang/gl,openstack/glance,takeshineshiro/glance,scripnichenko/glance,redhat-openstack/glance,ozamiatin/glance,sigmavirus24/glance,rajalokan/glance,kfwang/Glance-OVA-OVF,wkoathp/glance,sigmavirus24/glance,jumpstarter-io/glance,dims/glance,klmitch/glance,klmitch/glance,redhat-openstack/glance,saeki-masaki/glance,openstack/glance,akash1808/glance,kfwang/Glance-OVA-OVF,ozamiatin/glance,tanglei528/glance,vuntz/glance,dims/glance,vuntz/glance,scripnichenko/glance,JioCloud/glance,tanglei528/glance,stevelle/glance