Revert "bacon: name the package correctly"

This reverts commit 724feedbd9e668e239e827b974437da85c140313.

This breaks package naming, since a build.prop from a previous build
can be present before the cleanup rules apply, and this is variable
is generated before the build actually begins.
Most notably, this happens in jenkins with consecutive builds, even if
from different projects and tags.
mkvendor: fix echoed build commands

cm.mk.template uses PRODUCT_NAME := cm___DEVICE__

Change-Id: I063fc4b93d90ebb034637bf3e92d83c77aa439ca
build: Add support for extra kernel build variables

 * This allows specifying a variant defconfig, and an selinux defconfig
   which are simply configuration fragments.

Change-Id: I97882ae3b8c2e16ff6a7dce8dd3a70d70f8aa866
Merge remote-tracking branch 'upstream/cm-10.1' into cm-10.1