Fix chef windows task quoting
Fix chef windows task quoting

Former task command was using single quotes, relying on windows_task
implementation - based on schtasks.exe - that replace them by double
quotes.
A different windows_task implementation might change this behavior.

scalp42/chef-client,juliandunn/chef-client,scalp42/chef-client,GannettDigital/chef-client,chef-cookbooks/chef-client,mateuszkwiatkowski/chef-client,juliandunn/chef-client,chef-cookbooks/chef-client,mateuszkwiatkowski/chef-client,mateuszkwiatkowski/chef-client,GannettDigital/chef-client,opscode-cookbooks/chef-client,juliandunn/chef-client,drrk/chef-client,drrk/chef-client,drrk/chef-client,scalp42/chef-client,opscode-cookbooks/chef-client,GannettDigital/chef-client,mattray/chef-client,chef-cookbooks/chef-client,mattray/chef-client,burtlo/chef-client,opscode-cookbooks/chef-client,mattray/chef-client