Avoid docker inspect on each usage call
Avoid docker inspect on each usage call

Review: https://reviews.apache.org/r/26436

neilconway/mesos,abudnik/mesos,abudnik/mesos,gsantovena/mesos,andschwa/mesos,asamerh4/mesos,verizonlabs/mesos,dforsyth/mesos,yuquanshan/customizedMesos,chhsia0/mesos,abudnik/mesos,Gilbert88/mesos,zmalik/mesos,zmalik/mesos,yuquanshan/customizedMesos,chhsia0/mesos,chhsia0/mesos,yuquanshan/customizedMesos,dforsyth/mesos,asamerh4/mesos,zmalik/mesos,abudnik/mesos,chhsia0/mesos,kaysoky/mesos,zmalik/mesos,yuquanshan/customizedMesos,jpeach/mesos,dforsyth/mesos,asamerh4/mesos,neilconway/mesos,andschwa/mesos,dforsyth/mesos,Gilbert88/mesos,abudnik/mesos,neilconway/mesos,chhsia0/mesos,andschwa/mesos,zmalik/mesos,reneploetz/mesos,zmalik/mesos,craimbert/mesos,reneploetz/mesos,craimbert/mesos,kaysoky/mesos,reneploetz/mesos,Gilbert88/mesos,jpeach/mesos,gsantovena/mesos,reneploetz/mesos,Gilbert88/mesos,gsantovena/mesos,verizonlabs/mesos,neilconway/mesos,Aman-Jain-14/customizedMesos,jpeach/mesos,gsantovena/mesos,craimbert/mesos,andschwa/mesos,gsantovena/mesos,asamerh4/mesos,zmalik/mesos,chhsia0/mesos,asamerh4/mesos,craimbert/mesos,neilconway/mesos,asamerh4/mesos,Gilbert88/mesos,yuquanshan/customizedMesos,verizonlabs/mesos,Aman-Jain-14/customizedMesos,neilconway/mesos,Aman-Jain-14/customizedMesos,abudnik/mesos,abudnik/mesos,Aman-Jain-14/customizedMesos,andschwa/mesos,jpeach/mesos,asamerh4/mesos,craimbert/mesos,reneploetz/mesos,gsantovena/mesos,verizonlabs/mesos,verizonlabs/mesos,kaysoky/mesos,craimbert/mesos,yuquanshan/customizedMesos,Gilbert88/mesos,dforsyth/mesos,Aman-Jain-14/customizedMesos,kaysoky/mesos,jpeach/mesos,Aman-Jain-14/customizedMesos,neilconway/mesos,reneploetz/mesos,dforsyth/mesos,verizonlabs/mesos,craimbert/mesos,andschwa/mesos,andschwa/mesos,Aman-Jain-14/customizedMesos,dforsyth/mesos,jpeach/mesos,kaysoky/mesos,reneploetz/mesos,gsantovena/mesos,kaysoky/mesos,verizonlabs/mesos,jpeach/mesos,Gilbert88/mesos,chhsia0/mesos,yuquanshan/customizedMesos,kaysoky/mesos