Install npm

The nodejs module does not install npm by default, and it is needed in
order to use it as a package provider. Also remove the npm package test
from beaker, since it makes no sense for package 'npm' to be installed
by provider 'npm'.

Change-Id: Idc3d51399f1263eded3f373a7c852a609b15a204

manifests/frontend.pp

@@ -11,6 +11,7 @@ class openstack_health::frontend(
   class { '::nodejs':
     legacy_debian_symlinks => true,
     repo_url_suffix        => 'node_0.12',
+    npm_package_ensure     => 'present',
   }
 
   package { 'node-gyp':

spec/acceptance/frontend_spec.rb

@@ -31,7 +31,6 @@ describe 'puppet-openstack_health::api manifest', :if => ['debian', 'ubuntu'].in
 
     describe 'npm packages' do
       required_packages = [
-        package('npm'),
         package('node-gyp'),
         package('gulp'),
       ]