No more use loadall() for default_profider_for() function

Change-Id: Id16605cc834e0071328bec667fcc27502a2c0f30
Closes-Bug: #1575269
(cherry picked from commit b82c12e9f3)

deployment/puppet/l23network/spec/functions/default_provider_for__spec.rb

@@ -0,0 +1,14 @@
+require 'spec_helper'
+
+describe 'default_provider_for' do
+  let(:facts) {{
+      :osfamily => 'Debian',
+      :operatingsystem => 'Ubuntu',
+      :kernel => 'Linux',
+      :l23_os => 'ubuntu',
+      :l3_fqdn_hostname => 'stupid_hostname',
+  }}
+
+  it { is_expected.not_to eq(nil) }
+  it { is_expected.to run.with_params('file').and_return('posix') }
+end