Changing the PATH order we set for using the cfnbootstrap script we have installed in virtualenv rather than using default scripts

* Adding Kitchen test to verify the PATH  used for cfn-init is the one we have installed using virtualenv

Author: Himani Deshpande

cookbooks/aws-parallelcluster-environment/templates/cfn_bootstrap/pcluster.sh.erb

@@ -2,7 +2,6 @@
 # pcluster.sh:
 #   Setup ParallelCluster environment variables
 #
-
-PATH=$PATH:<%= @cfn_bootstrap_virtualenv_path %>/bin
+PATH=<%= @cfn_bootstrap_virtualenv_path %>/bin:$PATH
 
 export PATH

cookbooks/aws-parallelcluster-environment/test/controls/cfn_bootstrap_spec.rb

@@ -36,6 +36,12 @@
     its('mode') { should cmp '0644' }
     its('owner') { should eq 'root' }
     its('group') { should eq 'root' }
-    its('content') { should match "PATH=\\$PATH:#{pyenv_dir}/versions/#{cfn_python_version}/envs/cfn_bootstrap_virtualenv/bin" }
+    its('content') { should match "PATH=#{pyenv_dir}/versions/#{cfn_python_version}/envs/cfn_bootstrap_virtualenv/bin:\\$PATH" }
+  end
+
+  desc "cfn-init needs to be from the cfnbootstrap virtualenv"
+  describe bash("sudo -u #{node['cluster']['cluster_user']} -i which cfn-init") do
+    its('exit_status') { should eq(0) }
+    its('stdout') { should match("#{pyenv_dir}/versions/#{cfn_python_version}/envs/cfn_bootstrap_virtualenv/bin/cfn-init") }
   end
 end