Change ObjectMapper.setSerializationInclusion() to apply to content inclusion too

[cowtowncoder]

(note: follow-up from #1442)

As of 2.8, method setSerializationInclusion() only sets "value inclusion" (inclusion criteria value itself; POJO, Collection, Map) but NOT to "content inclusion" (values of structured types like Collections, Maps and arrays). For 2.9 let's make same value be applied for both; if they need to differ, add new method:

setDefaultPropertyInclusion(JsonInclude.Include value)

which allows specifying different inclusion criteria as necessary.