Execute the dropped_commands test case in port_SUITE
Execute the dropped_commands test case in port_SUITE

Also, fix cleaning up the OS environment setting modified by this test
case to prevent problems with later test cases using the echo_drv too.

kvakvs/otp,saleyn/otp,emacsmirror/erlang,aboroska/otp,fenollp/otp,fenollp/otp,mikpe/otp,dumbbell/otp,falkevik/otp,bsmr-erlang/otp,fenollp/otp,lrascao/otp,vinoski/otp,goertzenator/otp,tuncer/otp,jj1bdx/otp,falkevik/otp,jj1bdx/otp,uabboli/otp,isvilen/otp,goertzenator/otp,kvakvs/otp,g-andrade/otp,RaimoNiskanen/otp,RaimoNiskanen/otp,g-andrade/otp,cobusc/otp,RoadRunnr/otp,vladdu/otp,matwey/otp,dumbbell/otp,erlang/otp,lrascao/otp,RoadRunnr/otp,falkevik/otp,dgud/otp,cobusc/otp,emacsmirror/erlang,saleyn/otp,electricimp/otp,vladdu/otp,vladdu/otp,getong/otp,matwey/otp,bsmr-erlang/otp,lrascao/otp,cobusc/otp,legoscia/otp,bjorng/otp,bsmr-erlang/otp,bernardd/otp,ferd/otp,bsmr-erlang/otp,bjorng/otp,vinoski/otp,dumbbell/otp,cobusc/otp,goertzenator/otp,tuncer/otp,RoadRunnr/otp,kvakvs/otp,vladdu/otp,aboroska/otp,kvakvs/otp,vladdu/otp,aboroska/otp,erlang/otp,bsmr-erlang/otp,mikpe/otp,tuncer/otp,fenollp/otp,bjorng/otp,erlang/otp,isvilen/otp,vinoski/otp,potatosalad/otp,bernardd/otp,emacsmirror/erlang,emacsmirror/erlang,bernardd/otp,RoadRunnr/otp,emacsmirror/erlang,vladdu/otp,dumbbell/otp,g-andrade/otp,RaimoNiskanen/otp,ferd/otp,RoadRunnr/otp,potatosalad/otp,isvilen/otp,bsmr-erlang/otp,potatosalad/otp,falkevik/otp,kvakvs/otp,emacsmirror/erlang,mikpe/otp,rlipscombe/otp,goertzenator/otp,potatosalad/otp,rlipscombe/otp,saleyn/otp,bjorng/otp,tuncer/otp,ferd/otp,vinoski/otp,bjorng/otp,kvakvs/otp,saleyn/otp,RaimoNiskanen/otp,uabboli/otp,RoadRunnr/otp,mikpe/otp,getong/otp,ferd/otp,legoscia/otp,matwey/otp,potatosalad/otp,legoscia/otp,bjorng/otp,vladdu/otp,dumbbell/otp,aboroska/otp,potatosalad/otp,jj1bdx/otp,fenollp/otp,tuncer/otp,lrascao/otp,RoadRunnr/otp,lrascao/otp,bjorng/otp,emacsmirror/erlang,jj1bdx/otp,matwey/otp,isvilen/otp,jj1bdx/otp,bsmr-erlang/otp,uabboli/otp,dumbbell/otp,kvakvs/otp,isvilen/otp,erlang/otp,electricimp/otp,vinoski/otp,rlipscombe/otp,bjorng/otp,saleyn/otp,erlang/otp,g-andrade/otp,falkevik/otp,saleyn/otp,goertzenator/otp,RaimoNiskanen/otp,goertzenator/otp,g-andrade/otp,aboroska/otp,rlipscombe/otp,electricimp/otp,dumbbell/otp,jj1bdx/otp,RaimoNiskanen/otp,dgud/otp,getong/otp,RoadRunnr/otp,dgud/otp,jj1bdx/otp,uabboli/otp,goertzenator/otp,emacsmirror/erlang,bernardd/otp,bernardd/otp,goertzenator/otp,RaimoNiskanen/otp,potatosalad/otp,bjorng/otp,uabboli/otp,rlipscombe/otp,bernardd/otp,matwey/otp,getong/otp,falkevik/otp,uabboli/otp,bsmr-erlang/otp,electricimp/otp,mikpe/otp,falkevik/otp,mikpe/otp,falkevik/otp,falkevik/otp,vladdu/otp,ferd/otp,dgud/otp,saleyn/otp,legoscia/otp,lrascao/otp,mikpe/otp,legoscia/otp,uabboli/otp,tuncer/otp,g-andrade/otp,getong/otp,dgud/otp,matwey/otp,rlipscombe/otp,cobusc/otp,erlang/otp,fenollp/otp,RaimoNiskanen/otp,bsmr-erlang/otp,electricimp/otp,g-andrade/otp,mikpe/otp,dgud/otp,erlang/otp,rlipscombe/otp,jj1bdx/otp,dgud/otp,dumbbell/otp,potatosalad/otp,RaimoNiskanen/otp,mikpe/otp,g-andrade/otp,dumbbell/otp,cobusc/otp,electricimp/otp,isvilen/otp,cobusc/otp,isvilen/otp,dgud/otp,emacsmirror/erlang,tuncer/otp,vinoski/otp,vladdu/otp,legoscia/otp,mikpe/otp,kvakvs/otp,vinoski/otp,fenollp/otp,saleyn/otp,ferd/otp,isvilen/otp,uabboli/otp,bernardd/otp,goertzenator/otp,electricimp/otp,getong/otp,tuncer/otp,electricimp/otp,rlipscombe/otp,dumbbell/otp,ferd/otp,legoscia/otp,saleyn/otp,g-andrade/otp,legoscia/otp,getong/otp,ferd/otp,bernardd/otp,jj1bdx/otp,matwey/otp,isvilen/otp,uabboli/otp,rlipscombe/otp,dgud/otp,fenollp/otp,erlang/otp,vinoski/otp,matwey/otp,vinoski/otp,erlang/otp,aboroska/otp,tuncer/otp,getong/otp,emacsmirror/erlang,aboroska/otp,getong/otp,rlipscombe/otp,legoscia/otp,vinoski/otp,RoadRunnr/otp,aboroska/otp,cobusc/otp,lrascao/otp,matwey/otp,bernardd/otp,fenollp/otp,lrascao/otp,jj1bdx/otp,g-andrade/otp,isvilen/otp,erlang/otp,lrascao/otp,getong/otp,ferd/otp,potatosalad/otp,kvakvs/otp,dgud/otp,electricimp/otp,potatosalad/otp,aboroska/otp,bjorng/otp