[buildbot-script] add --reconfigure option
[buildbot-script] add --reconfigure option

Allow the user to force a configuration run even if his CMakeCache.txt
already exists.  This can be useful after editing CMakeCache.txt,
because sometimes the cmake run triggered by the build system is less
thorough.

Swift SVN r22848

natecook1000/swift,rudkx/swift,SwiftAndroid/swift,return/swift,OscarSwanros/swift,kperryua/swift,uasys/swift,cbrentharris/swift,swiftix/swift,shahmishal/swift,SwiftAndroid/swift,devincoughlin/swift,dduan/swift,ken0nek/swift,aschwaighofer/swift,LeoShimonaka/swift,huonw/swift,brentdax/swift,mightydeveloper/swift,gmilos/swift,karwa/swift,hooman/swift,zisko/swift,return/swift,JaSpa/swift,emilstahl/swift,jmgc/swift,sdulal/swift,tinysun212/swift-windows,natecook1000/swift,tjw/swift,shajrawi/swift,jckarter/swift,LeoShimonaka/swift,parkera/swift,practicalswift/swift,natecook1000/swift,aschwaighofer/swift,swiftix/swift,CodaFi/swift,nathawes/swift,dreamsxin/swift,djwbrown/swift,shajrawi/swift,modocache/swift,khizkhiz/swift,ben-ng/swift,brentdax/swift,danielmartin/swift,apple/swift,xedin/swift,austinzheng/swift,IngmarStein/swift,felix91gr/swift,manavgabhawala/swift,glessard/swift,lorentey/swift,sdulal/swift,jopamer/swift,xedin/swift,stephentyrone/swift,jmgc/swift,rudkx/swift,frootloops/swift,modocache/swift,KrishMunot/swift,kentya6/swift,swiftix/swift.old,shajrawi/swift,ben-ng/swift,manavgabhawala/swift,gottesmm/swift,xwu/swift,tardieu/swift,mightydeveloper/swift,austinzheng/swift,emilstahl/swift,kentya6/swift,cbrentharris/swift,shahmishal/swift,sschiau/swift,devincoughlin/swift,deyton/swift,jmgc/swift,tinysun212/swift-windows,roambotics/swift,airspeedswift/swift,zisko/swift,manavgabhawala/swift,gregomni/swift,tkremenek/swift,dreamsxin/swift,jmgc/swift,Jnosh/swift,jckarter/swift,amraboelela/swift,alblue/swift,xwu/swift,calebd/swift,khizkhiz/swift,sdulal/swift,aschwaighofer/swift,gribozavr/swift,emilstahl/swift,roambotics/swift,nathawes/swift,adrfer/swift,natecook1000/swift,modocache/swift,danielmartin/swift,JaSpa/swift,glessard/swift,amraboelela/swift,slavapestov/swift,lorentey/swift,arvedviehweger/swift,sschiau/swift,cbrentharris/swift,xedin/swift,JaSpa/swift,gribozavr/swift,arvedviehweger/swift,ben-ng/swift,apple/swift,atrick/swift,therealbnut/swift,felix91gr/swift,Jnosh/swift,modocache/swift,bitjammer/swift,djwbrown/swift,dduan/swift,parkera/swift,parkera/swift,CodaFi/swift,kperryua/swift,alblue/swift,sdulal/swift,danielmartin/swift,therealbnut/swift,amraboelela/swift,therealbnut/swift,deyton/swift,kperryua/swift,atrick/swift,gottesmm/swift,stephentyrone/swift,kusl/swift,benlangmuir/swift,airspeedswift/swift,russbishop/swift,frootloops/swift,MukeshKumarS/Swift,codestergit/swift,natecook1000/swift,kstaring/swift,sdulal/swift,jtbandes/swift,tkremenek/swift,harlanhaskins/swift,uasys/swift,tkremenek/swift,apple/swift,mightydeveloper/swift,johnno1962d/swift,allevato/swift,tardieu/swift,CodaFi/swift,russbishop/swift,zisko/swift,roambotics/swift,KrishMunot/swift,jckarter/swift,hughbe/swift,natecook1000/swift,milseman/swift,xedin/swift,shajrawi/swift,dduan/swift,Ivacker/swift,gottesmm/swift,huonw/swift,return/swift,uasys/swift,amraboelela/swift,danielmartin/swift,jtbandes/swift,huonw/swift,zisko/swift,milseman/swift,swiftix/swift.old,ahoppen/swift,khizkhiz/swift,tjw/swift,jckarter/swift,manavgabhawala/swift,ahoppen/swift,jckarter/swift,mightydeveloper/swift,LeoShimonaka/swift,johnno1962d/swift,Jnosh/swift,alblue/swift,stephentyrone/swift,frootloops/swift,rudkx/swift,johnno1962d/swift,JGiola/swift,swiftix/swift.old,gregomni/swift,karwa/swift,nathawes/swift,MukeshKumarS/Swift,rudkx/swift,hooman/swift,IngmarStein/swift,swiftix/swift,slavapestov/swift,brentdax/swift,lorentey/swift,karwa/swift,slavapestov/swift,modocache/swift,MukeshKumarS/Swift,modocache/swift,austinzheng/swift,shahmishal/swift,OscarSwanros/swift,uasys/swift,felix91gr/swift,parkera/swift,practicalswift/swift,swiftix/swift.old,Jnosh/swift,harlanhaskins/swift,return/swift,swiftix/swift.old,glessard/swift,calebd/swift,kstaring/swift,devincoughlin/swift,austinzheng/swift,brentdax/swift,deyton/swift,djwbrown/swift,KrishMunot/swift,jmgc/swift,zisko/swift,kusl/swift,dduan/swift,jckarter/swift,shajrawi/swift,manavgabhawala/swift,huonw/swift,danielmartin/swift,SwiftAndroid/swift,mightydeveloper/swift,kperryua/swift,JGiola/swift,swiftix/swift.old,jopamer/swift,CodaFi/swift,kusl/swift,kentya6/swift,arvedviehweger/swift,jopamer/swift,tinysun212/swift-windows,shajrawi/swift,nathawes/swift,jmgc/swift,ken0nek/swift,amraboelela/swift,milseman/swift,hughbe/swift,gmilos/swift,shahmishal/swift,austinzheng/swift,emilstahl/swift,amraboelela/swift,tjw/swift,kstaring/swift,calebd/swift,karwa/swift,jopamer/swift,KrishMunot/swift,emilstahl/swift,xwu/swift,MukeshKumarS/Swift,xwu/swift,therealbnut/swift,practicalswift/swift,calebd/swift,zisko/swift,cbrentharris/swift,kperryua/swift,kusl/swift,lorentey/swift,shahmishal/swift,apple/swift,aschwaighofer/swift,therealbnut/swift,rudkx/swift,xedin/swift,tardieu/swift,JaSpa/swift,tinysun212/swift-windows,tinysun212/swift-windows,stephentyrone/swift,benlangmuir/swift,OscarSwanros/swift,nathawes/swift,kperryua/swift,KrishMunot/swift,devincoughlin/swift,uasys/swift,kstaring/swift,milseman/swift,djwbrown/swift,alblue/swift,jtbandes/swift,tkremenek/swift,kusl/swift,lorentey/swift,sschiau/swift,practicalswift/swift,gmilos/swift,gribozavr/swift,allevato/swift,swiftix/swift.old,gribozavr/swift,JGiola/swift,arvedviehweger/swift,ahoppen/swift,adrfer/swift,codestergit/swift,allevato/swift,return/swift,SwiftAndroid/swift,swiftix/swift.old,tardieu/swift,ken0nek/swift,adrfer/swift,jopamer/swift,cbrentharris/swift,LeoShimonaka/swift,ben-ng/swift,bitjammer/swift,LeoShimonaka/swift,SwiftAndroid/swift,russbishop/swift,shajrawi/swift,khizkhiz/swift,jtbandes/swift,gribozavr/swift,LeoShimonaka/swift,JaSpa/swift,practicalswift/swift,kperryua/swift,huonw/swift,arvedviehweger/swift,parkera/swift,therealbnut/swift,hooman/swift,aschwaighofer/swift,sschiau/swift,CodaFi/swift,johnno1962d/swift,jmgc/swift,atrick/swift,allevato/swift,stephentyrone/swift,therealbnut/swift,atrick/swift,parkera/swift,frootloops/swift,LeoShimonaka/swift,Ivacker/swift,adrfer/swift,mightydeveloper/swift,russbishop/swift,sdulal/swift,LeoShimonaka/swift,hughbe/swift,adrfer/swift,arvedviehweger/swift,airspeedswift/swift,shahmishal/swift,tkremenek/swift,stephentyrone/swift,tjw/swift,brentdax/swift,bitjammer/swift,kstaring/swift,KrishMunot/swift,milseman/swift,manavgabhawala/swift,sschiau/swift,kentya6/swift,slavapestov/swift,apple/swift,emilstahl/swift,frootloops/swift,kusl/swift,xwu/swift,Jnosh/swift,johnno1962d/swift,gottesmm/swift,OscarSwanros/swift,tardieu/swift,felix91gr/swift,lorentey/swift,emilstahl/swift,tardieu/swift,SwiftAndroid/swift,codestergit/swift,OscarSwanros/swift,huonw/swift,dduan/swift,danielmartin/swift,apple/swift,gottesmm/swift,Ivacker/swift,karwa/swift,ken0nek/swift,benlangmuir/swift,parkera/swift,ahoppen/swift,JGiola/swift,devincoughlin/swift,CodaFi/swift,alblue/swift,gribozavr/swift,natecook1000/swift,airspeedswift/swift,hooman/swift,devincoughlin/swift,ahoppen/swift,IngmarStein/swift,codestergit/swift,lorentey/swift,adrfer/swift,gmilos/swift,swiftix/swift,deyton/swift,stephentyrone/swift,ahoppen/swift,gmilos/swift,shahmishal/swift,Ivacker/swift,zisko/swift,xedin/swift,IngmarStein/swift,return/swift,Ivacker/swift,hughbe/swift,khizkhiz/swift,sschiau/swift,codestergit/swift,lorentey/swift,bitjammer/swift,IngmarStein/swift,ken0nek/swift,cbrentharris/swift,karwa/swift,djwbrown/swift,hughbe/swift,practicalswift/swift,swiftix/swift,emilstahl/swift,bitjammer/swift,shajrawi/swift,nathawes/swift,JGiola/swift,MukeshKumarS/Swift,alblue/swift,return/swift,russbishop/swift,atrick/swift,xwu/swift,kentya6/swift,calebd/swift,hooman/swift,harlanhaskins/swift,hughbe/swift,gottesmm/swift,austinzheng/swift,khizkhiz/swift,modocache/swift,tardieu/swift,tkremenek/swift,kstaring/swift,nathawes/swift,calebd/swift,practicalswift/swift,xedin/swift,gribozavr/swift,JaSpa/swift,gribozavr/swift,airspeedswift/swift,brentdax/swift,roambotics/swift,allevato/swift,SwiftAndroid/swift,tinysun212/swift-windows,deyton/swift,slavapestov/swift,atrick/swift,kentya6/swift,johnno1962d/swift,russbishop/swift,benlangmuir/swift,frootloops/swift,tinysun212/swift-windows,frootloops/swift,gottesmm/swift,ken0nek/swift,IngmarStein/swift,swiftix/swift,JGiola/swift,CodaFi/swift,tjw/swift,russbishop/swift,glessard/swift,hughbe/swift,Ivacker/swift,bitjammer/swift,sdulal/swift,arvedviehweger/swift,khizkhiz/swift,IngmarStein/swift,dduan/swift,harlanhaskins/swift,parkera/swift,MukeshKumarS/Swift,kusl/swift,felix91gr/swift,codestergit/swift,glessard/swift,Jnosh/swift,swiftix/swift,KrishMunot/swift,ben-ng/swift,adrfer/swift,bitjammer/swift,kusl/swift,amraboelela/swift,tjw/swift,devincoughlin/swift,Ivacker/swift,deyton/swift,djwbrown/swift,jtbandes/swift,kentya6/swift,calebd/swift,uasys/swift,jtbandes/swift,kstaring/swift,OscarSwanros/swift,tjw/swift,gregomni/swift,harlanhaskins/swift,jtbandes/swift,sdulal/swift,cbrentharris/swift,benlangmuir/swift,felix91gr/swift,johnno1962d/swift,shahmishal/swift,MukeshKumarS/Swift,roambotics/swift,hooman/swift,karwa/swift,tkremenek/swift,sschiau/swift,milseman/swift,harlanhaskins/swift,jopamer/swift,ken0nek/swift,gmilos/swift,aschwaighofer/swift,Ivacker/swift,roambotics/swift,dduan/swift,milseman/swift,JaSpa/swift,Jnosh/swift,rudkx/swift,jopamer/swift,huonw/swift,karwa/swift,brentdax/swift,allevato/swift,allevato/swift,felix91gr/swift,slavapestov/swift,jckarter/swift,austinzheng/swift,ben-ng/swift,harlanhaskins/swift,xwu/swift,deyton/swift,mightydeveloper/swift,slavapestov/swift,gmilos/swift,kentya6/swift,mightydeveloper/swift,djwbrown/swift,xedin/swift,airspeedswift/swift,OscarSwanros/swift,sschiau/swift,glessard/swift,devincoughlin/swift,ben-ng/swift,danielmartin/swift,manavgabhawala/swift,codestergit/swift,gregomni/swift,benlangmuir/swift,airspeedswift/swift,alblue/swift,cbrentharris/swift,aschwaighofer/swift,practicalswift/swift,gregomni/swift,hooman/swift,uasys/swift,gregomni/swift