Be sure to have dcv installed at runtime

The dcv_install recipe is not called at runtime, because it is included
in the default.rb, but it is called only at AMI creation time.

At runtime the entry point is the <scheduler>_config,
that calls base_config and base_install,
so the dcv_install was not included.

From now we are calling the dcv_install at runtime case too,
the recipe is idempotent so it is not a problem.

Signed-off-by: Enrico Usai <usai@amazon.com>

Author: Enrico Usai

recipes/dcv_config.rb

@@ -59,6 +59,10 @@ def allow_gpu_acceleration
 end
 
 if node['platform'] == 'centos' && node['platform_version'].to_i == 7 && node['cfncluster']['cfn_node_type'] == "MasterServer"
+
+  # be sure to have DCV packages installed
+  include_recipe "aws-parallelcluster::dcv_install"
+
   node.default['cfncluster']['dcv']['is_graphic_instance'] = graphic_instance?
 
   if node.default['cfncluster']['dcv']['is_graphic_instance']