tempest: reduce compute/build_interval from 60 to 10
tempest: reduce compute/build_interval from 60 to 10

Try to reduce the time of jobs by reducing the build_interval value in
Tempest.

Change-Id: Ie6737c546e9bc1974491d45e2b932c8e400ed3db

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration