force data read from 'sysctl -a' into ASCSII, gets around https://bugzilla.redhat.com/show_bug.cgi?id=1879868 (#46)

Author: lukebigum

lib/puppet/provider/sysctl/augeas.rb

@@ -83,6 +83,7 @@ def self.instances(reference_resource = nil)
     end
 
     sysctl('-a').each_line do |line|
+      line = line.force_encoding("US-ASCII").scrub("")
       value = line.split(sep)
 
       key = value.shift.strip