b=21109 mds_lov_read_objids cleanup and conf-sanity tests (1.8)

b=21109 mds_lov_read_objids cleanup and conf-sanity tests (1.8)

calculate mds->mds_lov_objid_lastidx and mds->mds_lov_objid_lastpage correctly
have index strings big enough to store indicies in decimal
test to check size of lov_objid and
test to check configuraion with big indicies
minor compile fix to avoid compile warnings from gcc 4.0.2

i=adilger
i=panda
i=nathan