Added `AWAIT_TRUE_FOR`/`AWAIT_TRUE`, `AWAIT_FALSE_FOR`/`AWAIT_FALSE`.
Added `AWAIT_TRUE_FOR`/`AWAIT_TRUE`, `AWAIT_FALSE_FOR`/`AWAIT_FALSE`.

This is item (5) of MESOS-4112 with the following changes:
1. `AWAIT_TRUE_FOR`  alias to `AWAIT_ASSERT_TRUE_FOR`.
2. `AWAIT_TRUE`      alias to `AWAIT_ASSERT_TRUE`.
3. `AWAIT_FALSE_FOR` alias to `AWAIT_ASSERT_FALSE_FOR`.
4. `AWAIT_FALSE`     alias to `AWAIT_ASSERT_FALSE`.

Review: https://reviews.apache.org/r/45663/

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