Fix spec tests for RSpec 3.x and Puppet 4.x

Rix resource array, according[1].
[1]https://github.com/puppetlabs/puppet/blob/3.7.5/lib/puppet/resource.rb#L446-L453

This patch also update RSpec 3.x matcher in order to remove deprecation
warnings (in units).

Change-Id: Ib05351a3897dfb6d8dc52f696b27440af40382bd
Closes-bug: #1447620

spec/classes/tuskar_keystone_auth_spec.rb

@@ -23,7 +23,7 @@ describe 'tuskar::keystone::auth' do
 
     it { is_expected.to contain_keystone_user_role('tuskar@foobar').with(
       :ensure  => 'present',
-      :roles   => 'admin'
+      :roles   => ['admin']
     )}
 
     it { is_expected.to contain_keystone_service('tuskar').with(

spec/unit/provider/tuskar_config/ini_setting_spec.rb

@@ -22,8 +22,8 @@ describe provider_class do
       {:name => 'DEFAULT/foo', :value => 'bar'}
     )
     provider = provider_class.new(resource)
-    provider.section.should == 'DEFAULT'
-    provider.setting.should == 'foo'
+    expect(provider.section).to eq('DEFAULT')
+    expect(provider.setting).to eq('foo')
   end
 
   it 'should allow setting to be set explicitly' do
@@ -31,7 +31,7 @@ describe provider_class do
       {:name => 'dude/foo', :value => 'bar'}
     )
     provider = provider_class.new(resource)
-    provider.section.should == 'dude'
-    provider.setting.should == 'foo'
+    expect(provider.section).to eq('dude')
+    expect(provider.setting).to eq('foo')
   end
 end

spec/unit/type/tuskar_config_spec.rb

@@ -29,19 +29,19 @@ describe 'Puppet::Type.type(:tuskar_config)' do
 
   it 'should accept a valid value' do
     @tuskar_config[:value] = 'bar'
-    @tuskar_config[:value].should == 'bar'
+    expect(@tuskar_config[:value]).to eq('bar')
   end
 
   it 'should not accept a value with whitespace' do
     @tuskar_config[:value] = 'b ar'
-    @tuskar_config[:value].should == 'b ar'
+    expect(@tuskar_config[:value]).to eq('b ar')
   end
 
   it 'should accept valid ensure values' do
     @tuskar_config[:ensure] = :present
-    @tuskar_config[:ensure].should == :present
+    expect(@tuskar_config[:ensure]).to eq(:present)
     @tuskar_config[:ensure] = :absent
-    @tuskar_config[:ensure].should == :absent
+    expect(@tuskar_config[:ensure]).to eq(:absent)
   end
 
   it 'should not accept invalid ensure values' do