Bump src/collector

Bump cloudfoundry/collector:
  Alex Suraci:
     Add nil check when processing ( Travis Success: https://travis-ci.org/cloudfoundry/collector/builds/35382084 )

Signed-off-by: Michael Fraenkel <fraenkel@us.ibm.com>
Revert "Switch login job to look at uaa.login.client_secret only"

This reverts commit dab97e88506160ad94c61f0448179c88158e08dd.