changed read interval from 2.0 seconds to 0.1 to make simulator more responsive like real instrument.
changed read interval from 2.0 seconds to 0.1 to make simulator more responsive like real instrument.

fixes intermittent failure on buildbot for
  ion.agents.instrument.test.test_gateway_to_instrument_agent:TestInstrumentAgentViaGateway.test_autosample

ooici/coi-services,ooici/coi-services,ooici/coi-services,ooici/coi-services,ooici/coi-services