Fix all_named_products, remove kati_all_products

all_named_products was giving the file path instead of product name for
the name:path format of PRODUCT_MAKEFILES.

kati_all_products has been replaced with multiproduct_kati

Test: get_build_var all_named_products
Test: multiproduct_kati
Change-Id: I24015ef0778ac7cd45201aa55c1737b0553f09fe