Fully specify package key format, so external tools can generate it.
Fully specify package key format, so external tools can generate it.

Signed-off-by: Edward Z. Yang <dbd597f5635f432486c5d365e9bb585b3eaa1853@cs.stanford.edu>

seereason/cabal,sopvop/cabal,garetxe/cabal,eric-stanley/cabal,Peaker/cabal,plumlife/cabal,sopvop/cabal,kosmikus/cabal,fugyk/cabal,randen/cabal,Heather/cabal,edsko/cabal,thomie/cabal,martinvlk/cabal,valderman/cabal,plow-technologies/cabal,bennofs/cabal,kolmodin/cabal,ian-ross/cabal,triplepointfive/cabal,gridaphobe/cabal,mmakowski/cabal,sopvop/cabal,anton-dessiatov/cabal,mightybyte/cabal,themoritz/cabal,christiaanb/cabal,themoritz/cabal,rimmington/cabal,x-y-z/cabal,corngood/cabal,mightybyte/cabal,fugyk/cabal,mydaum/cabal,enolan/cabal,ian-ross/cabal,anton-dessiatov/cabal,ghc-android/cabal,headprogrammingczar/cabal,christiaanb/cabal,thoughtpolice/cabal,garetxe/cabal,Helkafen/cabal,lukexi/cabal,randen/cabal,triplepointfive/cabal,Helkafen/cabal,trskop/cabal,thomie/cabal,seereason/cabal,gridaphobe/cabal,beni55/cabal,x-y-z/cabal,ghc-android/cabal,themoritz/cabal,thoughtpolice/cabal,kosmikus/cabal,kolmodin/cabal,eric-stanley/cabal,bennofs/cabal,enolan/cabal,headprogrammingczar/cabal,mydaum/cabal,edsko/cabal,gbaz/cabal,gbaz/cabal,mmakowski/cabal,corngood/cabal,beni55/cabal,valderman/cabal,Peaker/cabal,rimmington/cabal,lukexi/cabal,plumlife/cabal,trskop/cabal,martinvlk/cabal,Heather/cabal,plow-technologies/cabal