add integration test for DEA loggregator logs

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
Bump src/collector

Bump cloudfoundry/collector:
  Alex Suraci and Maria Shaldibina:
     report DEA/Router host as 'ip' instead of 'host' ( Travis created: https://travis-ci.org/cloudfoundry/collector/builds/10950569 )