We currently support package-installs definitions which has some
limitations and oddities. This new format requires only one definition
which does not reside in our run-parts directories and follows a
consistent naming scheme (package-installs.yaml).
Change-Id: Ie51a7c4fdc15634ae8e069728e5e07cc1dc36095
Packages are often also installed in both the pre-install.d and
post-install.d phases. This patch expands the package-installs element
to support declarative package support for these phases in addition to
the existing support for install.d. The actual install/uninstall logic
is moved to common scripts under bin/ so that it can be reused across
the different phases.
Change-Id: Id51d0bbad232737fc8b5ffaf016dec50cd5b66c9