Await until the given condition evaluates to true or until a timeout

The timeout is taken from the innermost enclosing `within` block (if inside a `within` block) or the value specified in config value "akka.test.single-expect-default". The value is dilated, i.e. scaled by the factor specified in config value "akka.test.timefactor"..

A call to conditionIsFulfilled is done immediately, then the threads sleep for about a tenth of the timeout value, before it checks the condition again. This is repeated until timeout or the condition evaluates to true. To specify another interval, use the overload AwaitCondition(FuncBoolean, NullableTimeSpan, NullableTimeSpan, String)