BI-1947 - fix non-deterministic test

[mlm483]

Description

Story: https://breedinginsight.atlassian.net/browse/BI-1943

The ResponseUtilsIntegrationTest::postMultipleSearchSuccess fails sporadically because the randomly seeded data could occasionally result in 2 records being returned from the search query instead of the expected 1.

The hardcoded value that is searched for is slope=1.1, so I changed the code to ensure that the randomly created slope values will never be 1.1 (Math.random() produces a number in the range [0,1)).

Testing

Run the ResponseUtilsIntegrationTest suite.

Checklist:

• I have performed a self-review of my own code
• I have tested my code and ensured it meets the acceptance criteria of the story
• I have tested that my code works with both the brapi-java-server and BreedBase
• I have create/modified unit tests to cover this change
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to documentation
• I have run TAF: <please include a link to TAF run>

[davedrp]

Developer testing note: could not prove that the code fixed the problem (but it certainly has)