[Merge] lp:~zctgbhu/plymouth/bug-1339954 into lp:ubuntu/plymouth

[Ｖ字龍(Vdragon)]

AFAICS we should drop the dejavu font as long as there's no glyphs required for other locale's basic usage, since it just a boot-up screen anyway.

BTW, is Google Noto Sans font a better choice?  It divides many different locale glyphs into separate font files.
https://code.google.com/p/noto/
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https://code.launchpad.net/~zctgbhu/plymouth/bug-1339954/+merge/226236
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