Updated mesos to reflect base64::decode returning a Try.
Updated mesos to reflect base64::decode returning a Try.

Review: https://reviews.apache.org/r/37557

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