Fix AbstractBinderTests to populate properties

Some tests in `AbstractBinderTests` are rely on the partition header,
but that one can be populated only by the `PartitionInterceptor`.
To allow it we need to provide appropriate producer properties, like
`partitionKeyExpression`.

* Populate test-based `ProducerProperties` to the
`createBindableChannel()` where `PartitionInterceptor` is populated
* Fix `checkstyle.xml` static imports rule for Mockito-2.x as the
current base line

Fix for the proper `BindingProperties` usage

spring-cloud-stream-tools/src/main/resources/checkstyle.xml

@@ -85,7 +85,12 @@
         <module name="AvoidStarImport"/>
         <module name="AvoidStaticImport">
             <property name="excludes"
-                      value="org.junit.Assert.*,org.mockito.Mockito.*,org.mockito.Matchers.*,org.hamcrest.Matchers.*,org.assertj.core.api.Assertions.*"/>
+                      value="org.junit.Assert.*,
+                      org.mockito.Mockito.*,
+                      org.mockito.BDDMockito.*,
+                      org.mockito.ArgumentMatchers.*,
+                      org.hamcrest.Matchers.*,
+                      org.assertj.core.api.Assertions.*"/>
         </module>
         <module name="FallThrough"/>
         <module name="ImportOrder">