[gyb] Make `utils/gyb --test` to really perform doctest
[gyb] Make `utils/gyb --test` to really perform doctest

Because utils/gyb is just a launcher, `doctest.testmod()` without
explicit module doesn't perform doctest of `gyb` module.
It used to perform doctest of `util/gyb`, the `__main__` module.

OscarSwanros/swift,CodaFi/swift,allevato/swift,frootloops/swift,modocache/swift,huonw/swift,sschiau/swift,kstaring/swift,zisko/swift,manavgabhawala/swift,frootloops/swift,modocache/swift,tkremenek/swift,jckarter/swift,alblue/swift,jtbandes/swift,rudkx/swift,practicalswift/swift,parkera/swift,return/swift,devincoughlin/swift,modocache/swift,therealbnut/swift,tjw/swift,hooman/swift,zisko/swift,JaSpa/swift,return/swift,bitjammer/swift,tardieu/swift,gmilos/swift,lorentey/swift,JGiola/swift,ahoppen/swift,calebd/swift,Jnosh/swift,amraboelela/swift,kstaring/swift,russbishop/swift,JGiola/swift,xedin/swift,therealbnut/swift,aschwaighofer/swift,felix91gr/swift,ahoppen/swift,alblue/swift,gottesmm/swift,Jnosh/swift,hughbe/swift,jmgc/swift,glessard/swift,natecook1000/swift,gmilos/swift,zisko/swift,allevato/swift,brentdax/swift,glessard/swift,return/swift,arvedviehweger/swift,harlanhaskins/swift,frootloops/swift,OscarSwanros/swift,xwu/swift,shahmishal/swift,tardieu/swift,Jnosh/swift,stephentyrone/swift,apple/swift,kstaring/swift,aschwaighofer/swift,gregomni/swift,uasys/swift,amraboelela/swift,tardieu/swift,return/swift,swiftix/swift,milseman/swift,arvedviehweger/swift,jckarter/swift,roambotics/swift,frootloops/swift,codestergit/swift,sschiau/swift,arvedviehweger/swift,gottesmm/swift,calebd/swift,airspeedswift/swift,ben-ng/swift,OscarSwanros/swift,bitjammer/swift,harlanhaskins/swift,deyton/swift,lorentey/swift,allevato/swift,sschiau/swift,gmilos/swift,natecook1000/swift,shahmishal/swift,devincoughlin/swift,felix91gr/swift,rudkx/swift,shahmishal/swift,deyton/swift,hooman/swift,aschwaighofer/swift,JaSpa/swift,tinysun212/swift-windows,russbishop/swift,brentdax/swift,uasys/swift,glessard/swift,alblue/swift,xwu/swift,gregomni/swift,manavgabhawala/swift,tjw/swift,manavgabhawala/swift,benlangmuir/swift,devincoughlin/swift,apple/swift,gribozavr/swift,manavgabhawala/swift,atrick/swift,bitjammer/swift,natecook1000/swift,kstaring/swift,huonw/swift,huonw/swift,atrick/swift,kperryua/swift,zisko/swift,therealbnut/swift,djwbrown/swift,milseman/swift,kperryua/swift,Jnosh/swift,IngmarStein/swift,tardieu/swift,karwa/swift,benlangmuir/swift,milseman/swift,deyton/swift,frootloops/swift,zisko/swift,OscarSwanros/swift,tkremenek/swift,parkera/swift,djwbrown/swift,gmilos/swift,practicalswift/swift,shahmishal/swift,CodaFi/swift,natecook1000/swift,glessard/swift,ahoppen/swift,atrick/swift,swiftix/swift,apple/swift,glessard/swift,jtbandes/swift,tardieu/swift,kperryua/swift,karwa/swift,nathawes/swift,karwa/swift,airspeedswift/swift,jtbandes/swift,practicalswift/swift,gribozavr/swift,gmilos/swift,brentdax/swift,atrick/swift,jckarter/swift,tinysun212/swift-windows,stephentyrone/swift,devincoughlin/swift,modocache/swift,lorentey/swift,stephentyrone/swift,gregomni/swift,jckarter/swift,gmilos/swift,xwu/swift,return/swift,amraboelela/swift,sschiau/swift,danielmartin/swift,gottesmm/swift,bitjammer/swift,felix91gr/swift,shajrawi/swift,russbishop/swift,codestergit/swift,sschiau/swift,airspeedswift/swift,jmgc/swift,swiftix/swift,felix91gr/swift,atrick/swift,gribozavr/swift,shajrawi/swift,brentdax/swift,milseman/swift,karwa/swift,codestergit/swift,xedin/swift,roambotics/swift,huonw/swift,kperryua/swift,tjw/swift,return/swift,huonw/swift,felix91gr/swift,danielmartin/swift,glessard/swift,codestergit/swift,deyton/swift,ahoppen/swift,shajrawi/swift,hughbe/swift,therealbnut/swift,benlangmuir/swift,austinzheng/swift,codestergit/swift,IngmarStein/swift,shahmishal/swift,JaSpa/swift,huonw/swift,shajrawi/swift,arvedviehweger/swift,felix91gr/swift,JaSpa/swift,CodaFi/swift,djwbrown/swift,tkremenek/swift,harlanhaskins/swift,lorentey/swift,uasys/swift,jopamer/swift,amraboelela/swift,gribozavr/swift,gregomni/swift,Jnosh/swift,devincoughlin/swift,felix91gr/swift,ben-ng/swift,zisko/swift,gregomni/swift,JGiola/swift,kstaring/swift,return/swift,austinzheng/swift,tinysun212/swift-windows,tinysun212/swift-windows,sschiau/swift,deyton/swift,allevato/swift,djwbrown/swift,alblue/swift,karwa/swift,jckarter/swift,gottesmm/swift,amraboelela/swift,jopamer/swift,CodaFi/swift,CodaFi/swift,IngmarStein/swift,jopamer/swift,xwu/swift,xedin/swift,CodaFi/swift,bitjammer/swift,kperryua/swift,gribozavr/swift,austinzheng/swift,stephentyrone/swift,tinysun212/swift-windows,airspeedswift/swift,shajrawi/swift,IngmarStein/swift,shahmishal/swift,manavgabhawala/swift,Jnosh/swift,hooman/swift,jmgc/swift,bitjammer/swift,airspeedswift/swift,austinzheng/swift,arvedviehweger/swift,airspeedswift/swift,nathawes/swift,devincoughlin/swift,aschwaighofer/swift,gribozavr/swift,rudkx/swift,karwa/swift,tkremenek/swift,tkremenek/swift,roambotics/swift,xwu/swift,harlanhaskins/swift,tjw/swift,brentdax/swift,gregomni/swift,calebd/swift,xedin/swift,russbishop/swift,tjw/swift,gribozavr/swift,uasys/swift,harlanhaskins/swift,therealbnut/swift,danielmartin/swift,JaSpa/swift,hughbe/swift,roambotics/swift,jtbandes/swift,ahoppen/swift,kstaring/swift,hooman/swift,JaSpa/swift,amraboelela/swift,calebd/swift,russbishop/swift,IngmarStein/swift,ben-ng/swift,CodaFi/swift,natecook1000/swift,hughbe/swift,austinzheng/swift,gottesmm/swift,parkera/swift,harlanhaskins/swift,xedin/swift,frootloops/swift,hughbe/swift,hooman/swift,aschwaighofer/swift,Jnosh/swift,gmilos/swift,tardieu/swift,modocache/swift,russbishop/swift,benlangmuir/swift,milseman/swift,ben-ng/swift,milseman/swift,tkremenek/swift,frootloops/swift,IngmarStein/swift,ahoppen/swift,kperryua/swift,shajrawi/swift,apple/swift,airspeedswift/swift,jopamer/swift,xedin/swift,nathawes/swift,roambotics/swift,modocache/swift,ben-ng/swift,nathawes/swift,parkera/swift,alblue/swift,aschwaighofer/swift,deyton/swift,tjw/swift,swiftix/swift,therealbnut/swift,kstaring/swift,jckarter/swift,JaSpa/swift,codestergit/swift,manavgabhawala/swift,devincoughlin/swift,nathawes/swift,jmgc/swift,allevato/swift,nathawes/swift,sschiau/swift,jtbandes/swift,hughbe/swift,gottesmm/swift,codestergit/swift,swiftix/swift,brentdax/swift,tinysun212/swift-windows,lorentey/swift,stephentyrone/swift,xwu/swift,sschiau/swift,austinzheng/swift,deyton/swift,xedin/swift,shahmishal/swift,rudkx/swift,practicalswift/swift,jmgc/swift,brentdax/swift,ben-ng/swift,harlanhaskins/swift,jopamer/swift,JGiola/swift,zisko/swift,gribozavr/swift,alblue/swift,jmgc/swift,uasys/swift,huonw/swift,tardieu/swift,roambotics/swift,benlangmuir/swift,lorentey/swift,rudkx/swift,jtbandes/swift,OscarSwanros/swift,hooman/swift,aschwaighofer/swift,djwbrown/swift,xedin/swift,benlangmuir/swift,tjw/swift,apple/swift,ben-ng/swift,jmgc/swift,calebd/swift,stephentyrone/swift,natecook1000/swift,uasys/swift,calebd/swift,atrick/swift,kperryua/swift,rudkx/swift,shajrawi/swift,russbishop/swift,danielmartin/swift,swiftix/swift,swiftix/swift,jopamer/swift,calebd/swift,allevato/swift,natecook1000/swift,modocache/swift,djwbrown/swift,danielmartin/swift,practicalswift/swift,lorentey/swift,parkera/swift,amraboelela/swift,hooman/swift,OscarSwanros/swift,danielmartin/swift,devincoughlin/swift,jckarter/swift,tkremenek/swift,alblue/swift,tinysun212/swift-windows,JGiola/swift,lorentey/swift,hughbe/swift,uasys/swift,manavgabhawala/swift,stephentyrone/swift,nathawes/swift,practicalswift/swift,gottesmm/swift,JGiola/swift,jtbandes/swift,parkera/swift,practicalswift/swift,apple/swift,jopamer/swift,IngmarStein/swift,milseman/swift,therealbnut/swift,arvedviehweger/swift,bitjammer/swift,karwa/swift,allevato/swift,arvedviehweger/swift,parkera/swift,danielmartin/swift,karwa/swift,djwbrown/swift,shahmishal/swift,parkera/swift,OscarSwanros/swift,xwu/swift,austinzheng/swift,practicalswift/swift,shajrawi/swift