Overlap of test_relationals and test_bruteforce

In `test_bruteforce` there are couple of tests focused on kernel procedures which are already covered by `test_relationals`:

```
isequal
isgreater
isgreaterequal
isless
islessequal
islessgreater
isnotequal
```

There are also other kernel procedures which should/could land in `test_relationals` for consistency:

```
isfinite
isinf
isnan
isnormal
isordered
isunordered
```

Compare test_relationals and test_bruteforce, focusing on the listed kernel procedures and their existing coverage. Run the relevant OpenCL CTS tests before and after the organization changes. Done means duplicate relational coverage is removed and the additional procedures are placed consistently in test_relationals.

Written by the indexing model from the issue text.