Add tests for windows and remove usage of OPENSSL to check MD5 as keytool has that capability

Conflicts:
	spec/acceptance/keystore_spec.rb
	spec/acceptance/private_key_spec.rb
	spec/acceptance/truststore_spec.rb
	spec/spec_helper_acceptance.rb
This should be handled as an acceptance setup step. The problem is the test forge instance is using a new CA cert that is issued by neither GeoTrust nor Gandi, see https://tickets.puppetlabs.com/browse/OPS-4555