Change contain_exec path from list to string

spec/defines/swift_ringbuilder_create_spec.rb

@@ -31,7 +31,7 @@ describe 'swift::ringbuilder::create' do
 
             it { should contain_exec("create_#{type}").with(
               {:command => "swift-ring-builder /etc/swift/#{type}.builder create #{param_hash[:part_power]} #{param_hash[:replicas]} #{param_hash[:min_part_hours]}",
-               :path    => ['/usr/bin'],
+               :path    => '/usr/bin',
                :creates => "/etc/swift/#{type}.builder" }
             )}
           end

spec/defines/swift_ringbuilder_rebalance_spec.rb

@@ -8,7 +8,7 @@ describe 'swift::ringbuilder::rebalance' do
         end
         it { should contain_exec("rebalance_#{type}").with(
           {:command     => "swift-ring-builder /etc/swift/#{type}.builder rebalance",
-           :path        => ['/usr/bin'],
+           :path        => '/usr/bin',
            :refreshonly => true}
         )}
       end

spec/defines/swift_storage_xfs_spec.rb

@@ -35,7 +35,7 @@ describe 'swift::storage::xfs' do
 
         it { should contain_exec("mkfs-foo").with(
           :command     => "mkfs.xfs -i size=#{param_hash[:byte_size]} #{param_hash[:device]}",
-          :path        => ['/sbin/'],
+          :path        => '/sbin/',
           :refreshonly => true,
           :require     => 'Package[xfsprogs]'
         )}