Improved operation feedback example framework.
Improved operation feedback example framework.

This patch makes the operation feedback example framework use a long
filter when accepting offers and revive offers when it receives an
`OPERATION_FINISHED` operation status update.

Review: https://reviews.apache.org/r/70478/

reneploetz/mesos,chhsia0/mesos,Gilbert88/mesos,abudnik/mesos,kaysoky/mesos,dforsyth/mesos,reneploetz/mesos,dforsyth/mesos,Gilbert88/mesos,dforsyth/mesos,gsantovena/mesos,chhsia0/mesos,Gilbert88/mesos,reneploetz/mesos,chhsia0/mesos,gsantovena/mesos,reneploetz/mesos,kaysoky/mesos,gsantovena/mesos,Gilbert88/mesos,kaysoky/mesos,chhsia0/mesos,chhsia0/mesos,kaysoky/mesos,abudnik/mesos,abudnik/mesos,abudnik/mesos,gsantovena/mesos,chhsia0/mesos,reneploetz/mesos,gsantovena/mesos,kaysoky/mesos,chhsia0/mesos,Gilbert88/mesos,dforsyth/mesos,kaysoky/mesos,Gilbert88/mesos,reneploetz/mesos,dforsyth/mesos,abudnik/mesos,dforsyth/mesos,Gilbert88/mesos,dforsyth/mesos,gsantovena/mesos,abudnik/mesos,kaysoky/mesos,abudnik/mesos,gsantovena/mesos,reneploetz/mesos