ec2-api job: remove tempest from rally job
ec2-api job: remove tempest from rally job

Since ec2-api`s rally job uses own flavor 'm1.nano' is not
needed.
And rally script creates m1.nano by self and fails if tempest
created it before.

Change-Id: I3c021956ddc47a6c4cc9bb8c3f5b669c51e3b0e1

Tesora/tesora-project-config,openstack-infra/project-config,dongwenjuan/project-config,dongwenjuan/project-config,openstack-infra/project-config,Tesora/tesora-project-config