[update-checkout] Allow --dump-hashes to skip directories.
[update-checkout] Allow --dump-hashes to skip directories.

If I don't have certain things checked out, it shouldn't crash.

nathawes/swift,jtbandes/swift,felix91gr/swift,shahmishal/swift,allevato/swift,alblue/swift,CodaFi/swift,karwa/swift,frootloops/swift,jckarter/swift,atrick/swift,tkremenek/swift,harlanhaskins/swift,rudkx/swift,xedin/swift,Jnosh/swift,allevato/swift,deyton/swift,benlangmuir/swift,airspeedswift/swift,rudkx/swift,natecook1000/swift,jckarter/swift,jtbandes/swift,xedin/swift,hughbe/swift,calebd/swift,huonw/swift,glessard/swift,alblue/swift,parkera/swift,hughbe/swift,jckarter/swift,nathawes/swift,gregomni/swift,alblue/swift,CodaFi/swift,hughbe/swift,xedin/swift,hooman/swift,sschiau/swift,shahmishal/swift,austinzheng/swift,ahoppen/swift,benlangmuir/swift,natecook1000/swift,calebd/swift,swiftix/swift,glessard/swift,felix91gr/swift,natecook1000/swift,natecook1000/swift,CodaFi/swift,austinzheng/swift,milseman/swift,brentdax/swift,jtbandes/swift,gribozavr/swift,hughbe/swift,glessard/swift,CodaFi/swift,JGiola/swift,return/swift,hooman/swift,felix91gr/swift,ahoppen/swift,brentdax/swift,jopamer/swift,OscarSwanros/swift,frootloops/swift,zisko/swift,nathawes/swift,xedin/swift,aschwaighofer/swift,amraboelela/swift,milseman/swift,aschwaighofer/swift,airspeedswift/swift,Jnosh/swift,gregomni/swift,hooman/swift,karwa/swift,gribozavr/swift,jckarter/swift,rudkx/swift,parkera/swift,shajrawi/swift,allevato/swift,brentdax/swift,zisko/swift,amraboelela/swift,practicalswift/swift,hughbe/swift,felix91gr/swift,gribozavr/swift,lorentey/swift,aschwaighofer/swift,jmgc/swift,tkremenek/swift,milseman/swift,austinzheng/swift,tkremenek/swift,OscarSwanros/swift,lorentey/swift,parkera/swift,huonw/swift,djwbrown/swift,JGiola/swift,natecook1000/swift,zisko/swift,xedin/swift,karwa/swift,danielmartin/swift,sschiau/swift,airspeedswift/swift,shajrawi/swift,parkera/swift,xwu/swift,jckarter/swift,atrick/swift,shahmishal/swift,Jnosh/swift,calebd/swift,roambotics/swift,airspeedswift/swift,amraboelela/swift,huonw/swift,lorentey/swift,frootloops/swift,brentdax/swift,Jnosh/swift,devincoughlin/swift,stephentyrone/swift,apple/swift,roambotics/swift,hughbe/swift,swiftix/swift,jmgc/swift,swiftix/swift,huonw/swift,ahoppen/swift,karwa/swift,airspeedswift/swift,tjw/swift,roambotics/swift,nathawes/swift,natecook1000/swift,uasys/swift,xedin/swift,glessard/swift,aschwaighofer/swift,aschwaighofer/swift,danielmartin/swift,CodaFi/swift,nathawes/swift,gribozavr/swift,Jnosh/swift,benlangmuir/swift,swiftix/swift,devincoughlin/swift,shahmishal/swift,alblue/swift,OscarSwanros/swift,gregomni/swift,apple/swift,shajrawi/swift,jopamer/swift,OscarSwanros/swift,zisko/swift,sschiau/swift,zisko/swift,devincoughlin/swift,roambotics/swift,zisko/swift,allevato/swift,swiftix/swift,milseman/swift,milseman/swift,jopamer/swift,amraboelela/swift,huonw/swift,deyton/swift,tkremenek/swift,jmgc/swift,shajrawi/swift,devincoughlin/swift,benlangmuir/swift,benlangmuir/swift,harlanhaskins/swift,shahmishal/swift,jckarter/swift,brentdax/swift,djwbrown/swift,huonw/swift,uasys/swift,deyton/swift,gregomni/swift,practicalswift/swift,alblue/swift,atrick/swift,uasys/swift,stephentyrone/swift,harlanhaskins/swift,huonw/swift,uasys/swift,xwu/swift,apple/swift,nathawes/swift,calebd/swift,OscarSwanros/swift,parkera/swift,lorentey/swift,milseman/swift,devincoughlin/swift,stephentyrone/swift,calebd/swift,gribozavr/swift,deyton/swift,amraboelela/swift,roambotics/swift,jckarter/swift,JGiola/swift,jmgc/swift,airspeedswift/swift,return/swift,danielmartin/swift,xedin/swift,allevato/swift,uasys/swift,benlangmuir/swift,gregomni/swift,shahmishal/swift,ahoppen/swift,apple/swift,OscarSwanros/swift,djwbrown/swift,xwu/swift,xwu/swift,xwu/swift,practicalswift/swift,swiftix/swift,frootloops/swift,sschiau/swift,djwbrown/swift,xwu/swift,austinzheng/swift,practicalswift/swift,hooman/swift,deyton/swift,return/swift,austinzheng/swift,shajrawi/swift,uasys/swift,tkremenek/swift,jopamer/swift,karwa/swift,shahmishal/swift,return/swift,hooman/swift,practicalswift/swift,harlanhaskins/swift,roambotics/swift,tjw/swift,glessard/swift,atrick/swift,tjw/swift,amraboelela/swift,hughbe/swift,practicalswift/swift,xwu/swift,frootloops/swift,sschiau/swift,hooman/swift,CodaFi/swift,deyton/swift,danielmartin/swift,JGiola/swift,shajrawi/swift,atrick/swift,jmgc/swift,tjw/swift,danielmartin/swift,calebd/swift,felix91gr/swift,devincoughlin/swift,frootloops/swift,harlanhaskins/swift,frootloops/swift,parkera/swift,jmgc/swift,jtbandes/swift,gribozavr/swift,uasys/swift,airspeedswift/swift,hooman/swift,practicalswift/swift,lorentey/swift,return/swift,lorentey/swift,brentdax/swift,felix91gr/swift,apple/swift,karwa/swift,jtbandes/swift,parkera/swift,felix91gr/swift,zisko/swift,return/swift,swiftix/swift,harlanhaskins/swift,jtbandes/swift,practicalswift/swift,rudkx/swift,danielmartin/swift,shajrawi/swift,jopamer/swift,jopamer/swift,sschiau/swift,amraboelela/swift,jmgc/swift,atrick/swift,tjw/swift,rudkx/swift,JGiola/swift,jtbandes/swift,tkremenek/swift,deyton/swift,aschwaighofer/swift,alblue/swift,tkremenek/swift,brentdax/swift,OscarSwanros/swift,gribozavr/swift,alblue/swift,gregomni/swift,danielmartin/swift,natecook1000/swift,gribozavr/swift,stephentyrone/swift,rudkx/swift,ahoppen/swift,JGiola/swift,return/swift,karwa/swift,CodaFi/swift,calebd/swift,stephentyrone/swift,lorentey/swift,djwbrown/swift,tjw/swift,sschiau/swift,xedin/swift,Jnosh/swift,lorentey/swift,allevato/swift,jopamer/swift,austinzheng/swift,sschiau/swift,stephentyrone/swift,djwbrown/swift,nathawes/swift,milseman/swift,parkera/swift,apple/swift,tjw/swift,austinzheng/swift,stephentyrone/swift,ahoppen/swift,Jnosh/swift,djwbrown/swift,karwa/swift,shajrawi/swift,devincoughlin/swift,allevato/swift,shahmishal/swift,aschwaighofer/swift,glessard/swift,harlanhaskins/swift,devincoughlin/swift