Ensure ComputationRefs endpoint only returns refs, not computations

[zack-rma]

Problem Description

Fixes #383.

GET /computationrefs is returning full computation DTO's

Solution

Replaced method call used in computation reference retrieval. Updated integration testing to match.

how you tested the change

Integration tested against OpenTSDB and CWMS database instances.

Where the following done:

• Tests. Check all that apply:
  • Unit tests created or modified that run during ant test.
  • Integration tests created or modified that run during integration testing
    (Formerly called regression tests.)
  • Test procedure descriptions for manual testing
• Was relevant documentation updated?
• Were relevant config element (e.g. XML data) updated as appropriate

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