Added a test to verify recovering mixed known and unknown orphans for port mapping isolator.
Added a test to verify recovering mixed known and unknown orphans for
port mapping isolator.

Review: https://reviews.apache.org/r/35750

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