qemu: Add a Knobs unit test
qemu: Add a Knobs unit test

We test that all true and all false knobs parameters are properly built.

Signed-off-by: Samuel Ortiz <0ba86cb3f08bbb861958e54bd3438887adb4263c@linux.intel.com>

leoswaldo/ciao,jorgevgut/ciao,mcastelino/ciao,rbradford/ciao,obedmr/ciao,matthewrsj/ciao,ciao-project/ciao,01org/ciao,mrkz/ciao,01org/ciao,obedmr/ciao,mrkz/ciao,tpepper/ciao,mcastelino/ciao,mrkz/ciao,wcwxyz/ciao,leoswaldo/ciao,kaccardi/ciao,tpepper/ciao,erick0z/ciao,jorgevgut/ciao,jorgevgut/ciao,matthewrsj/ciao,leoswaldo/ciao,kaccardi/ciao,wcwxyz/ciao,mcastelino/ciao,obedmr/ciao,markdryan/ciao,erick0z/ciao,rbradford/ciao,markdryan/ciao,matthewrsj/ciao,tpepper/ciao,erick0z/ciao,wcwxyz/ciao,ciao-project/ciao