(PUP-11022) Allow Dir.entries

Newer facter versions call Dir.entries during fact resolution/provider loading,
so call the original method by default. This fixes errors of the form:

    #<Dir (class)> received :entries with unexpected arguments
      expected: ("tmp")
      got: ("/Users/josh/.facter/facts.d")

Author: joshcooper

spec/unit/provider/service/init_spec.rb

@@ -83,6 +83,7 @@
       allow(provider_class).to receive(:defpath).and_return('tmp')
 
       @services = ['one', 'two', 'three', 'four', 'umountfs']
+      allow(Dir).to receive(:entries).and_call_original
       allow(Dir).to receive(:entries).with('tmp').and_return(@services)
       expect(FileTest).to receive(:directory?).with('tmp').and_return(true)
       allow(FileTest).to receive(:executable?).and_return(true)

spec/unit/provider/service/openwrt_spec.rb

@@ -32,6 +32,7 @@
     allow(File).to receive(:directory?).with('/etc/init.d').and_return(true)
 
     allow(Puppet::FileSystem).to receive(:exist?).with('/etc/init.d/myservice').and_return(true)
+    allow(FileTest).to receive(:file?).and_call_original
     allow(FileTest).to receive(:file?).with('/etc/init.d/myservice').and_return(true)
     allow(FileTest).to receive(:executable?).with('/etc/init.d/myservice').and_return(true)
   end
@@ -47,7 +48,8 @@
     let(:services) {['dnsmasq', 'dropbear', 'firewall', 'led', 'puppet', 'uhttpd' ]}
 
     before :each do
-      allow(Dir).to receive(:entries).and_return(services)
+      allow(Dir).to receive(:entries).and_call_original
+      allow(Dir).to receive(:entries).with('/etc/init.d').and_return(services)
       allow(FileTest).to receive(:directory?).and_return(true)
       allow(FileTest).to receive(:executable?).and_return(true)
     end