It is sometimes useful to tell ConfigTemplateParser to write
out options that are valueless and not suffixed with '=' or ':',
such as when overriding a my.cnf.
This commit adds the 'ignore_none_type' attribute to the config_template
module. If this attribute is set to false, then valueless options will be
written out to the resultant INI file as-is, without the '=' or ':' suffix.
Change-Id: I5c88b2019c01b44193a5d0df9299ecce6de52f01
Partial-Bug: #1693234
76d5f02a32