t179: remove unused $_instance class variable
t179: remove unused $_instance class variable

zazabe/cm,mariansollmann/CM,mariansollmann/CM,cargomedia/CM,christopheschwyzer/CM,tomaszdurka/CM,njam/CM,fvovan/CM,fvovan/CM,fvovan/CM,vogdb/cm,zazabe/cm,njam/CM,njam/CM,fauvel/CM,christopheschwyzer/CM,cargomedia/CM,njam/CM,fvovan/CM,tomaszdurka/CM,cargomedia/CM,alexispeter/CM,njam/CM,tomaszdurka/CM,christopheschwyzer/CM,fauvel/CM,fauvel/CM,vogdb/cm,vogdb/cm,christopheschwyzer/CM,zazabe/cm,fauvel/CM,vogdb/cm,alexispeter/CM,zazabe/cm,vogdb/cm,tomaszdurka/CM,alexispeter/CM,mariansollmann/CM,cargomedia/CM,mariansollmann/CM,alexispeter/CM,tomaszdurka/CM,fauvel/CM