With previous commit we handle setting aio option when running unikernel, but we didn't handle the implicit unikernel run that occurs during the composing/building phase. This resulted in error since QEMU was provided with empty string "" as aio-type, which didn't work.
Opened this PR just to have it unit tested by Travis before merging to master. I'll merge it myself then, bypassing the code review, due to heavy load on reviewers.
With previous commit we handle setting aio option when running unikernel, but we didn't handle the implicit unikernel run that occurs during the composing/building phase. This resulted in error since QEMU was provided with empty string "" as aio-type, which didn't work.