[Merge] lp:~gerboland/qtubuntu/adopt-more-eglconvenience2 into lp:qtubuntu

[Gerry Boland]

Ok, the above remove the SurfaceFormat filtering stuff, instead 
1. using QSurfaceFormat::defaultFormat to set the use of RGB888 by default. If user changes that, it's their responsibility.
2. adding a policy where if the user-requested config failed to be chosen on Mesa, it will retry with GL1.4.
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https://code.launchpad.net/~gerboland/qtubuntu/adopt-more-eglconvenience2/+merge/295248
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