Bug 851281 - No apps are showing in the v1.0.1 version build r=fabrice

Makes |make dogfood| identical to |DOGFOOD=1 make production| and |make
production| the same than |PRODUCTION=1 make reset-gaia|. The goals are now only
shortcuts to using reset-gaia with these env variables.
(cherry picked from commit 82a25aa673c684f0178ab5865f97ad565e4643af)

Kept the line about GAIA_OPTIMIZE even though it's not used here,
to facilitate future possible uplift concerning this variable.

Conflicts:
	Makefile