[ADD] use PageServiceManagerInterface
[ADD] use PageServiceManagerInterface

to prevent namespace errors during overriding
Dunduro/SonataPageBundle,Dunduro/SonataPageBundle,Dunduro/SonataPageBundle,grimpows/SonataPageBundle,grimpows/SonataPageBundle,Aylarius/SonataPageBundle,Dunduro/SonataPageBundle,Aylarius/SonataPageBundle,Th3Mouk/SonataPageBundle,Dunduro/SonataPageBundle,grimpows/SonataPageBundle,Aylarius/SonataPageBundle,grimpows/SonataPageBundle,Aylarius/SonataPageBundle,grimpows/SonataPageBundle,Th3Mouk/SonataPageBundle,Th3Mouk/SonataPageBundle,Th3Mouk/SonataPageBundle,Aylarius/SonataPageBundle,sonata-project/SonataPageBundle,sonata-project/SonataPageBundle