set_value method of Puppet::Util::IniFile uses '' for separator when
called without the separator argument[1]. Set the argument explicitly
to avoid broken rendering. Note that the argument was added in
puppetlabs-inifile 2.0.0 so we don't need to bump the min version.
[1] https://github.com/puppetlabs/puppetlabs-inifile/issues/544
Closes-Bug: #2081303
Change-Id: I6112c6d12e860bd4b4030e5f784952a7358f617f
(cherry picked from commit 93f15aa78c378dd853e000156ad14dfff15fa394)
(cherry picked from commit 5769e2a9bd787966d444b7964921c2e8e373dca2)
(cherry picked from commit a0dbacabb44350c816e56924ff50fe74ee7da81c)
3f54cf79e6