Better default settings for MESA and GALIUM_HUD

[SHJ]

I suggest to put these settings in ubuntu-gaming package or something similar

GALLIUM_HUD_VISIBLE=false
GALLIUM_HUD_TOGGLE_SIGNAL=10
GALLIUM_HUD_PERIOD=0.1
GALLIUM_HUD=.x10.y200.h80.w300.c240.dfps;.x10.y300.h80.w300.c100cpu+GPU-load:100;.x10.y400.h80.w300requested-VRAM+VRAM-usage

References:
https://docs.mesa3d.org/envvars.html#gallium-environment-variables

[SHJ (skiphopjump)]

Don't forget that PCIe can have hot plug (but not common).

The best solution should respect hot plug and external cards.

References:
https://electronics.stackexchange.com/questions/208767/does-pcie-hotplug-actually-work-in-practice

[Ubuntu Foundations Team Bug Bot (crichton)]

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