It was failing with:
	Rendering SLS 'base:salt.minion.cert' failed: Conflicting ID 'salt_ca_certificates_packages'

ca-certificates installation should be probably moved out of the loop in
the future.

Change-Id: I26aeae62cc1c1d407d36d1d6bf101db073d9e601

Change-Id: I89cec95e87db52fd59a84d57c485d8c938711ef3

Change-Id: I1eaa9cf7a7f861cc5de604e03fba8a74436d99ad

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

Change-Id: I6b20ab4e1795298c94f55fdc61af99f933d8491c

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