Removed unused checks in command executor.
Removed unused checks in command executor.

Review: https://reviews.apache.org/r/40107

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