Previous approach fails when all of formulas are installed from git.

Change-Id: I0622461ee6469c59c1fd3ad4a23cdaeaeee1b444

Install all pkgs for formulas together.

This error occures when multiple certs signed by same CA are requested
on minion.

Change-Id: I6b20ab4e1795298c94f55fdc61af99f933d8491c

First run is made during salt-master cloud-init and thus it is onchanges
is not suitable here because ca.crt file is already generated.

Letsencrypt could makes symlinks to standard locations in the future.

It was responsible for

    [CRITICAL] Rendering SLS 'base:salt.minion.cert' failed: Jinja variable 'dict object' has no attribute 'cfg01.mk20-lab-advanced.local'
    [ERROR   ] Data passed to highstate outputter is not a valid highstate return: {'local': ["Rendering SLS 'base:salt.minion.cert' failed: Jinja variable 'dict object' has no attribute 'cfg01.mk20-lab-advanced.local'"]}

- allow defining custom key/cert path
- ensure key/cert directories
- set key/cert permissions by metadata

source:engine metadata created - defaults to pkg
installation, pip installation alternative added