Move systemd check to activate_packages()
Move systemd check to activate_packages()

It's more straightforward to skip calling the function than to turn it
into a no-op.

kensipe/dcos,xinxian0458/dcos,mesosphere-mergebot/dcos,lingmann/dcos,BenWhitehead/dcos,dcos/dcos,amitaekbote/dcos,mellenburg/dcos,mesosphere-mergebot/mergebot-test-dcos,branden/dcos,kensipe/dcos,xinxian0458/dcos,BenWhitehead/dcos,kensipe/dcos,dcos/dcos,mesosphere-mergebot/dcos,jeid64/dcos,BenWhitehead/dcos,surdy/dcos,asridharan/dcos,branden/dcos,mesosphere-mergebot/dcos,GoelDeepak/dcos,mesosphere-mergebot/mergebot-test-dcos,darkonie/dcos,amitaekbote/dcos,mnaboka/dcos,surdy/dcos,xinxian0458/dcos,vishnu2kmohan/dcos,mellenburg/dcos,dcos/dcos,mellenburg/dcos,mnaboka/dcos,mesosphere-mergebot/mergebot-test-dcos,vishnu2kmohan/dcos,mesosphere-mergebot/mergebot-test-dcos,darkonie/dcos,vishnu2kmohan/dcos,asridharan/dcos,mellenburg/dcos,jeid64/dcos,mnaboka/dcos,amitaekbote/dcos,GoelDeepak/dcos,asridharan/dcos,branden/dcos,GoelDeepak/dcos,jeid64/dcos,dcos/dcos,BenWhitehead/dcos,surdy/dcos,kensipe/dcos,lingmann/dcos,darkonie/dcos,asridharan/dcos,branden/dcos,dcos/dcos,mnaboka/dcos,xinxian0458/dcos,mnaboka/dcos,lingmann/dcos,mesosphere-mergebot/dcos,vishnu2kmohan/dcos,darkonie/dcos,jeid64/dcos,GoelDeepak/dcos,amitaekbote/dcos,lingmann/dcos,darkonie/dcos,surdy/dcos