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

A minus at the end of a block prevents whitespace to be added.
In this particular case a new line between the last parameter in a section
and the next section is ommitted. The result looks like this:

[Section1]
Param1=Value
Param2=Value[Section2]
Param3=Value

Change-Id: I9faba3857f46f70ec0ddc380e6b84f72a5dc16e4

Change-Id: I54bc92902137899834408732ab852fd96d3f5a53