add fix spec tests for redhat

RedHat did set the options on every run. Since we now
only set the options file if there are options, we allow
an empty option string and set this as default for redhat.

Author: trefzer

data/RedHat.yaml

@@ -4,3 +4,4 @@ chrony::config_keys: /etc/chrony.keys
 chrony::config: /etc/chrony.conf
 chrony::wait_manage: true
 chrony::options_file: /etc/sysconfig/chronyd
+chrony::options: ''

manifests/init.pp

@@ -348,7 +348,7 @@
   Optional[Integer[0]] $ntsrotate                                  = undef,
   Optional[Integer[1,65535]] $acquisitionport                      = undef,
   Optional[Stdlib::Absolutepath] $options_file                     = undef,
-  Optional[String[1]] $options                                     = undef,
+  Optional[String] $options                                        = undef,
   String[1] $options_template                                      = 'chrony/chronyd.epp',
   Optional[Integer[0]] $ptpport                                    = undef,
   Optional[Integer[0,255]] $ptpdomain                              = undef,