Change number of threads of keystone to 1

The number of keystone threads in apache
was changed to 1 to solve keystone performance
degradation issue.

Closes-Bug: #1628534

(cherry picked from commit 22652dc0a7)

Change-Id: Iba8f2c7a6f7da10caae2c451ea420f88d6c28a46

deployment/puppet/openstack_tasks/manifests/keystone/keystone.pp

@@ -151,7 +151,7 @@ class openstack_tasks::keystone::keystone {
 
   class { '::keystone::wsgi::apache':
     priority              => '05',
-    threads               => 3,
+    threads               => 1,
     workers               => min($::processorcount, 6),
     ssl                   => $ssl,
     vhost_custom_fragment => $vhost_limit_request_field_size,

tests/noop/spec/hosts/keystone/keystone_spec.rb

@@ -215,26 +215,26 @@ describe manifest do
         should contain_keystone_config('eventlet_server/admin_workers').with(:value => service_workers)
      end
 
-     it 'should declare keystone::wsgi::apache class with 4 processess and 3 threads on 4 CPU system' do
+     it 'should declare keystone::wsgi::apache class with 4 processess and 1 threads on 4 CPU system' do
        should contain_class('keystone::wsgi::apache').with(
-         'threads'               => '3',
+         'threads'               => '1',
          'workers'               => '4',
          'vhost_custom_fragment' => 'LimitRequestFieldSize 81900'
        )
      end
 
-     it 'should declare keystone::wsgi::apache class with 6 processes and 3 threads on 48 CPU system' do
+     it 'should declare keystone::wsgi::apache class with 6 processes and 1 threads on 48 CPU system' do
        facts[:processorcount] = 48
        should contain_class('keystone::wsgi::apache').with(
-         'threads' => '3',
+         'threads' => '1',
          'workers' => '6'
        )
      end
 
-     it 'should declare keystone::wsgi::apache class with 1 process and 3 threads on 1 CPU system' do
+     it 'should declare keystone::wsgi::apache class with 1 process and 1 threads on 1 CPU system' do
        facts[:processorcount] = 1
        should contain_class('keystone::wsgi::apache').with(
-         'threads' => '3',
+         'threads' => '1',
          'workers' => '1'
        )
      end