Added mesos v1 test helper 'v1::createCallAccept()'.
Added mesos v1 test helper 'v1::createCallAccept()'.

Review: https://reviews.apache.org/r/52718/

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