[SR-1628] Run swift-integration-tests in a sandboxed directory.
[SR-1628] Run swift-integration-tests in a sandboxed directory.

 - This should fix possible issues with the test outputs being in a shared
   directory on CI machines running concurrent builds.

 - https://bugs.swift.org/browse/SR-1628

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