Improved logs displayed after a slave failed recovery.
Improved logs displayed after a slave failed recovery.

Add some steps to clean the Docker daemon
state used by the Docker containerizer.

Review: https://reviews.apache.org/r/64379/

kaysoky/mesos,Gilbert88/mesos,Gilbert88/mesos,Gilbert88/mesos,gsantovena/mesos,dforsyth/mesos,abudnik/mesos,Gilbert88/mesos,jpeach/mesos,jpeach/mesos,abudnik/mesos,reneploetz/mesos,reneploetz/mesos,reneploetz/mesos,kaysoky/mesos,gsantovena/mesos,Gilbert88/mesos,asamerh4/mesos,chhsia0/mesos,reneploetz/mesos,dforsyth/mesos,abudnik/mesos,kaysoky/mesos,gsantovena/mesos,asamerh4/mesos,chhsia0/mesos,abudnik/mesos,reneploetz/mesos,chhsia0/mesos,dforsyth/mesos,kaysoky/mesos,Gilbert88/mesos,dforsyth/mesos,abudnik/mesos,gsantovena/mesos,jpeach/mesos,Gilbert88/mesos,chhsia0/mesos,asamerh4/mesos,gsantovena/mesos,chhsia0/mesos,kaysoky/mesos,kaysoky/mesos,andschwa/mesos,andschwa/mesos,dforsyth/mesos,kaysoky/mesos,dforsyth/mesos,gsantovena/mesos,reneploetz/mesos,asamerh4/mesos,andschwa/mesos,reneploetz/mesos,jpeach/mesos,andschwa/mesos,jpeach/mesos,asamerh4/mesos,andschwa/mesos,asamerh4/mesos,chhsia0/mesos,jpeach/mesos,dforsyth/mesos,abudnik/mesos,andschwa/mesos,asamerh4/mesos,andschwa/mesos,jpeach/mesos,abudnik/mesos,gsantovena/mesos,chhsia0/mesos