agent and full integration tests use dummy infrastructure in agent

This time we also deal with running the agent in bosh_micro stage in the
stemcell builder.

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
accept but ignore system root and no-alerts flag

This is for compatability with how the ruby agent runs in tests

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
use local blobstore in integration tests

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>