add mechanism to invoke logging of statistics
bump ion-defs
bump submodules for rpc timing stats
Merge branch 'master' of github.com:ooici/coi-services into rpc_stats
Merge pull request #822 from ooici/rpc_stats

statistics management
Bumped ion-defs
Externalized vis monitor timeout value
Merge pull request #824 from shenrie/master

Externalized vis monitor timeout value
merge upstream/master
disable port agent helper for the moment
include the recently enabled 5 instrument simulator instances (for a total of
 7) on sbe37-simulator.oceanobservatories.org.  The 7 instruments are created
  successfully in test_platform_hierarchy_with_some_instruments  but only 2
  assigned to platforms as there are some strange issues.