ut-core: Upgrade build_ut.sh template to choose new or next best revision of test suite

[kanjoe24]

Can we run through the logic once again here please.

For ex say we have these tags:

1.6.0
1.6.1
1.6.2
1.7.0
2.0.0
2.0.1
2.0.2
2.1.0
2.1.1
2.1.2
2.1.3
2.1.4
3.0.0
3.1.0
3.1.1
3.2.0
3.2.1
3.2.2
3.2.3
3.2.4
4.0.0
4.1.0

And the UT_PROJECT_VERSION set is "2." So we should be selecting 2.1.4 right.

[Ulrond]

If u choose 5.0 then it should choose best next highest. Which would be 4.1.0

Probably need some test input for your fu croon to ensure correctness