Multiple Fixes

Fixes [PyDAP Handler Doesn't Support Sparse Array Types OOIION-1278](https://jira.oceanobservatories.org/tasks/browse/OOIION-1278)

Fixes r2_full test_sparse_values transient error

Adds example code and multiple test containers to debug instruments and preload problems.

[DM Tests](http://buildbot.oceanobservatories.org:8010/builders/coi_any/builds/99)
[SMOKE Tests](http://buildbot.oceanobservatories.org:8010/builders/coi_smoke/builds/2825)