[ironic] Install open-iscsi package evidently

Make sure open-iscsi package has installed evidently
in order to cover standalone ironic conductor case.
Also ipmitool package has been removed since it's
installed by class of ironic::conductor.

Closes-Bug: #1636291
Change-Id: I242c26e8b0dc6401ed53c1221bd4c1f049deb815
(cherry picked from commit 184889dbe7)

deployment/puppet/openstack_tasks/manifests/roles/ironic_conductor.pp

@@ -152,7 +152,8 @@ class openstack_tasks::roles::ironic_conductor {
     require   => File["${tftp_root}/map-file"],
   }
 
-  ensure_packages('ipmitool', { ensure => 'present' })
+  # TODO(mpolenchuk): remove it once this package have installed by dependency
+  ensure_packages('open-iscsi')
 
   file { '/etc/ironic/fuel_key':
     ensure  => present,

tests/noop/spec/hosts/roles/ironic-conductor_spec.rb

@@ -37,9 +37,7 @@ describe manifest do
         )
       end
 
-      it 'should contain ipmitool package' do
-        should contain_package('ipmitool')
-      end
+      it { is_expected.to contain_package('open-iscsi') }
 
       it 'should declare ironic::conductor class correctly' do
         should contain_class('ironic::conductor').with(