Add in a few global options.  Feel free to rename them, they're just the first thing that came to mind.
Add in a few global options.  Feel free to rename them, they're just the first thing that came to mind.

src/python/m5/__init__.py:
    Add in a few global options.

--HG--
extra : convert_revision : e0dba78dd60f565a2e5cbda2cd6cf221bb3f4688

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