Remove the hpacktests module by default
Remove the hpacktests module by default

We don't change the code this exercises enough to pay for the build
time and complexity it adds.

ansman/okhttp,yschimke/okhttp,ze-pequeno/okhttp,ansman/okhttp,tiarebalbi/okhttp,tiarebalbi/okhttp,cmzy/okhttp,ze-pequeno/okhttp,cketti/okhttp,square/okhttp,square/okhttp,cketti/okhttp,ze-pequeno/okhttp,square/okhttp,cketti/okhttp,yschimke/okhttp,tiarebalbi/okhttp,yschimke/okhttp,ansman/okhttp,cmzy/okhttp