Before:
 Float Divergence Tester does not test the divergence even if Divergence Provider is ON

After:
 Float Divergence Tester test the divergence with epsilon span if Divergence Provider is ON

We needed the following condition to test the divergence on Float Divergence
Tester:

"Divergence Provider is ON"  AND
("Absolute Tolerance has some value"  OR
 "Relative Tolerance has some value" )

However this default behavior was not consistent with other testers, and
difficult to notice from the user interface.
Thus test the divergence by default with the epsilon span which is defined in
FloatDivergenceTester class.