Configure username and email for temp git repo.

Git's auto-detection may fail on host where hostname is letters
only. This would trigger "Please tell me who you are." and cause the
deployment/setup to fail. So configure the user.name and user.email.

scm_helper/libraries/archive.rb

@@ -28,7 +28,7 @@ def prepare_archive_checkouts(scm_options)
 
         execute 'create git repository' do
           cwd "#{tmpdir}/archive.d"
-          command "find . -type d -name .git -exec rm -rf {} \\;; find . -type f -name .gitignore -exec rm -f {} \\;; git init; git add .; git commit -m 'Create temporary repository from downloaded contents.'"
+          command "find . -type d -name .git -exec rm -rf {} \\;; find . -type f -name .gitignore -exec rm -f {} \\;; git init; git add .; git config user.name 'AWS OpsWorks'; git config user.email 'root@localhost'; git commit -m 'Create temporary repository from downloaded contents.'"
         end
 
         "#{tmpdir}/archive.d"