Bump src/gnatsd; expose gnatsd monitoring config

- nats job can be configured via deployment manifest to turn on monitoring
  and pprof support (turned off by default)

[#70091334]

Bump apcera/gnatsd:
  Derek Collison:
     pass by address ( Travis Success: https://travis-ci.org/apcera/gnatsd/builds/23780878 )
     bad copy of file ( Travis Failed: https://travis-ci.org/apcera/gnatsd/builds/23780486 )
     Bumped version ( Travis Failed: https://travis-ci.org/apcera/gnatsd/builds/23778241 )
     Added perf test for defers and parseInt ( Travis Failed: https://travis-ci.org/apcera/gnatsd/builds/23777928 )
     Merge pull request #30 from pivotal-cf-experimental/profiling-port-config-file ( Travis Success: https://travis-ci.org/apcera/gnatsd/builds/23777792 )
     perf results ( Travis Success: https://travis-ci.org/apcera/gnatsd/builds/23777610 )
     syntax ( Travis Success: https://travis-ci.org/apcera/gnatsd/builds/23135704 )
     Should receive msgs ( Travis Unknown )
     Added results from go1.2.1 on new MBA ( Travis Unknown )
     Added in three and four token match benchmarks ( Travis Unknown )
  Eric Malm:
     Make profiling port configurable via file ( Travis Unknown )

Signed-off-by: Eric Malm <emalm@pivotallabs.com>