Target all e2e datacenters for system and sysbatch e2e tests.  They
require that the system jobs run on all linux clients.

However, the jobs currenly only target `dc1` datacenter, but the nightly
e2e cluster has 4 clients spread in `dc1` and `dc2` datacenters, causing
the tests to fail.

I missed this problem in e2e dev cluster because it only used a single
dc1 datacenter.