[gyb] Popen explicit string instead of byte sequence
[gyb] Popen explicit string instead of byte sequence

The Popen command on Python returns a byte sequence on stdout by
default. However by sending the constructor the argument
`universal_newlines=True` it forces the Popen to put a string on stdout.

This was not a problem on Python 2 because the Python 2 regex engine
seemed to work find on byte sequences where Python 3's does not. By
explicitly converting everything to a string the same behavior is now
seen on Python 2 and 3.

See: https://docs.python.org/2/library/subprocess.html#frequently-used-arguments
See: https://docs.python.org/3/library/subprocess.html#frequently-used-arguments

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oman/swift,jopamer/swift,slavapestov/swift,SwiftAndroid/swift,xwu/swift,modocache/swift,danielmartin/swift,hooman/swift,parkera/swift,milseman/swift,johnno1962d/swift,kstaring/swift,tardieu/swift,codestergit/swift,ahoppen/swift,manavgabhawala/swift,xedin/swift,gregomni/swift,practicalswift/swift,amraboelela/swift,IngmarStein/swift,Jnosh/swift,gottesmm/swift,rudkx/swift,xedin/swift,tkremenek/swift,natecook1000/swift,tkremenek/swift,bitjammer/swift,djwbrown/swift,jckarter/swift,alblue/swift,sschiau/swift,djwbrown/swift,apple/swift,ahoppen/swift,stephentyrone/swift,glessard/swift,gribozavr/swift,austinzheng/swift,alblue/swift,gmilos/swift,adrfer/swift,return/swift,alblue/swift,dreamsxin/swift,ken0nek/swift,atrick/swift,OscarSwanros/swift,KrishMunot/swift,frootloops/swift,djwbrown/swift,swiftix/swift,harlanhaskins/swift,shahmishal/swift,modocache/swift,gribozavr/swift,JaSpa/swift,shajrawi/swift,atrick/swift,gregomni/swift,return/swift,felix91gr/swift,CodaFi/swift,jmgc/swift,austinzheng/swift,kstaring/swift,milseman/swift,SwiftAndroid/swift,milseman/swift,sschiau/swift,sschiau/swift,benlangmuir/swift,gmilos/swift,natecook1000/swift,calebd/swift,jmgc/swift,huonw/swift,xwu/swift,kperryua/swift,tjw/swift,amraboelela/swift,practicalswift/swift,roambotics/swift,JGiola/swift,dduan/swift,russbishop/swift,therealbnut/swift,gregomni/swift,therealbnut/swift,tjw/swift,calebd/swift,danielmartin/swift,rudkx/swift,amraboelela/swift,huonw/swift,rudkx/swift,CodaFi/swift,tkremenek/swift,codestergit/swift,rudkx/swift,deyton/swift,devincoughlin/swift,arvedviehweger/swift,therealbnut/swift,benlangmuir/swift,brentdax/swift,stephentyrone/swift,ben-ng/swift,uasys/swift,therealbnut/swift,KrishMunot/swift,jopamer/swift,codestergit/swift,calebd/swift,brentdax/swift,russbishop/swift,dduan/swift,allevato/swift,jckarter/swift,uasys/swift,jmgc/swift,kstaring/swift,tinysun212/swift-windows,lorentey/swift,arvedviehweger/swift,uasys/swift,atrick/swift,xedin/swift,gottesmm/swift,gmilos/swift,allevato/swift,benlangmuir/swift,tkremenek/swift,shajrawi/swift,therealbnut/swift,JGiola/swift,tardieu/swift,IngmarStein/swift,apple/swift,CodaFi/swift,tardieu/swift,adrfer/swift,nathawes/swift,parkera/swift,amraboelela/swift,tjw/swift,nathawes/swift,tinysun212/swift-windows,dduan/swift,practicalswift/swift,dduan/swift,bitjammer/swift,dreamsxin/swift,tardieu/swift,gregomni/swift,aschwaighofer/swift,manavgabhawala/swift,shahmishal/swift,aschwaighofer/swift,austinzheng/swift,ben-ng/swift,gottesmm/swift,hooman/swift,parkera/swift,devincoughlin/swift,stephentyrone/swift,Jnosh/swift,harlanhaskins/swift,jmgc/swift,glessard/swift,ahoppen/swift,nathawes/swift,jopamer/swift,shahmishal/swift,xedin/swift,benlangmuir/swift,gottesmm/swift,jtbandes/swift,deyton/swift,stephentyrone/swift,JGiola/swift,devincoughlin/swift,calebd/swift,tjw/swift,aschwaighofer/swift,roambotics/swift,devincoughlin/swift,therealbnut/swift,KrishMunot/swift,harlanhaskins/swift,jtbandes/swift,return/swift,xedin/swift,frootloops/swift,ben-ng/swift,OscarSwanros/swift,tjw/swift,SwiftAndroid/swift,JaSpa/swift,huonw/swift,Jnosh/swift,return/swift,jckarter/swift,allevato/swift,practicalswift/swift,gribozavr/swift,austinzheng/swift,tardieu/swift,uasys/swift,russbishop/swift,bitjammer/swift,jopamer/swift,swiftix/swift,hughbe/swift,airspeedswift/swift,airspeedswift/swift,jtbandes/swift,ken0nek/swift,jopamer/swift