test-cases: add passthrough for -race
test-cases: add passthrough for -race

The -race option is useful and should pass through to the 'go test'
invocation if specified on the test-cases command line.

Signed-off-by: Tim Pepper <8dbd764830e941d092a1cb7fa16423169acc0b04@linux.intel.com>

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