Merge pull request #987 from shenrie/master

Fixes for intermitantly failing governance tests
Updates cov model ref
Merge pull request #988 from lukecampbell/cov_bump

Updates cov model ref
Make sub type strings.
Bump persistence test timeout to 5m.
Fix AS integration test
Merge branch 'master' of github.com:ooici/coi-services
Bumped ion-defs