Services such as Zookeeper and Kafka use ini files which do not
explicitly specify sections. This change supports merging ini
files with no sections, so that the configuration for these
services follows the example configuration provided for them
as closely as possible.

Closes-Bug: #1756101
Partially-Implements: blueprint monasca-roles
Change-Id: I1061729875e5545c7af7d80779f9c2124b6c7134

There is inconsistent use of either `/usr/bin/python` or
`/usr/bin/env python`. This makes for unexpected results when a
user might be using a virtualenv.

Change-Id: Ibb030f920a8869f9113ade70b66a921cc815060d

Change-Id: I7df581243deef7bda4b9b5926addf61421bd42f7

Change-Id: Ibf9ee55c48a5181c5ba3aa46bef485cd3468f14c
Closes-Bug: #1647065