Change-Id: Ifb45b2cf72d71caa9c8a63f8e7684fd15b81e450
Implements: jira/CLOUDB-487
Signed-off-by: Gabor Orosz <gabor.orosz@ericsson.com>

Yaml serializer splits long lines into multiple lines, which causes salt
parsing of generated yaml to fail.

Ensure presence of file to be serialized through one of the serializer modules
(see: https://docs.saltstack.com/en/latest/ref/serializers/all/index.html):

iteritems() was dropped in recent Python3 releases and items() is compatible
with Python 2.7.

Change-Id: Ia286ac4377c6b03ce16c9dc1a5c7d3441efe7e12

file.managed use "mode" option and not "file_mode" to configure the
perms of the managed file.
See: https://docs.saltstack.com/en/latest/ref/states/all/salt.states.file.html#salt.states.file.managed

Change-Id: Ibd0a024bcd69089d9835a18f2bb803c952e13967