VIVO-82 Merge the filters that set up VitroRequest models

VitroRequestPrep and WebappDaoFactorySDBPrep merge to RequestModelsPrep. WebappDaoFactorySparqlPrep goes away.
VIVO-120 VitroRequest.getFullWebappDaoFactory() is poorly named.

In fact, it returns a reference to the unfilteredWebappDaoFactory, and this was changed (broken) by the work on VIVO-82.