Better exceptions in python config
Better exceptions in python config

python/m5/config.py:
    Don't raise a new exception, just modify and re-raise the old one.

--HG--
extra : convert_revision : 47f6da3a8cb2ee18a6b400863e7ea80ab0c9a5ea

cancro7/gem5,joerocklin/gem5,gedare/gem5,rallylee/gem5,yb-kim/gemV,powerjg/gem5-ci-test,yb-kim/gemV,HwisooSo/gemV-update,HwisooSo/gemV-update,SanchayanMaity/gem5,joerocklin/gem5,austinharris/gem5-riscv,samueldotj/TeeRISC-Simulator,kaiyuanl/gem5,qizenguf/MLC-STT,zlfben/gem5,zlfben/gem5,KuroeKurose/gem5,aclifton/cpeg853-gem5,powerjg/gem5-ci-test,joerocklin/gem5,rjschof/gem5,KuroeKurose/gem5,TUD-OS/gem5-dtu,rjschof/gem5,zlfben/gem5,SanchayanMaity/gem5,HwisooSo/gemV-update,yb-kim/gemV,kaiyuanl/gem5,joerocklin/gem5,joerocklin/gem5,markoshorro/gem5,briancoutinho0905/2dsampling,rjschof/gem5,samueldotj/TeeRISC-Simulator,SanchayanMaity/gem5,zlfben/gem5,rallylee/gem5,samueldotj/TeeRISC-Simulator,TUD-OS/gem5-dtu,markoshorro/gem5,sobercoder/gem5,gem5/gem5,aclifton/cpeg853-gem5,rallylee/gem5,TUD-OS/gem5-dtu,yb-kim/gemV,sobercoder/gem5,briancoutinho0905/2dsampling,HwisooSo/gemV-update,austinharris/gem5-riscv,austinharris/gem5-riscv,cancro7/gem5,rallylee/gem5,briancoutinho0905/2dsampling,gem5/gem5,Weil0ng/gem5,cancro7/gem5,cancro7/gem5,aclifton/cpeg853-gem5,samueldotj/TeeRISC-Simulator,gedare/gem5,SanchayanMaity/gem5,austinharris/gem5-riscv,KuroeKurose/gem5,rallylee/gem5,zlfben/gem5,kaiyuanl/gem5,qizenguf/MLC-STT,powerjg/gem5-ci-test,aclifton/cpeg853-gem5,briancoutinho0905/2dsampling,joerocklin/gem5,cancro7/gem5,aclifton/cpeg853-gem5,Weil0ng/gem5,Weil0ng/gem5,rallylee/gem5,KuroeKurose/gem5,kaiyuanl/gem5,aclifton/cpeg853-gem5,qizenguf/MLC-STT,markoshorro/gem5,yb-kim/gemV,cancro7/gem5,HwisooSo/gemV-update,qizenguf/MLC-STT,Weil0ng/gem5,yb-kim/gemV,markoshorro/gem5,gedare/gem5,markoshorro/gem5,SanchayanMaity/gem5,TUD-OS/gem5-dtu,gem5/gem5,sobercoder/gem5,rjschof/gem5,Weil0ng/gem5,joerocklin/gem5,rjschof/gem5,qizenguf/MLC-STT,TUD-OS/gem5-dtu,samueldotj/TeeRISC-Simulator,markoshorro/gem5,samueldotj/TeeRISC-Simulator,powerjg/gem5-ci-test,aclifton/cpeg853-gem5,sobercoder/gem5,sobercoder/gem5,kaiyuanl/gem5,qizenguf/MLC-STT,gem5/gem5,rjschof/gem5,KuroeKurose/gem5,KuroeKurose/gem5,kaiyuanl/gem5,samueldotj/TeeRISC-Simulator,austinharris/gem5-riscv,rjschof/gem5,TUD-OS/gem5-dtu,yb-kim/gemV,Weil0ng/gem5,yb-kim/gemV,qizenguf/MLC-STT,zlfben/gem5,gem5/gem5,gem5/gem5,markoshorro/gem5,gem5/gem5,sobercoder/gem5,austinharris/gem5-riscv,sobercoder/gem5,SanchayanMaity/gem5,briancoutinho0905/2dsampling,KuroeKurose/gem5,joerocklin/gem5,gedare/gem5,cancro7/gem5,Weil0ng/gem5,zlfben/gem5,HwisooSo/gemV-update,SanchayanMaity/gem5,rallylee/gem5,briancoutinho0905/2dsampling,powerjg/gem5-ci-test,gedare/gem5,austinharris/gem5-riscv,briancoutinho0905/2dsampling,HwisooSo/gemV-update,powerjg/gem5-ci-test,kaiyuanl/gem5,gedare/gem5,powerjg/gem5-ci-test,TUD-OS/gem5-dtu,gedare/gem5