Fix exception when log_level is already a symbol
Fix exception when log_level is already a symbol

Signed-off-by: joe.nuspl <9a26904f0b2b68e21031422ce456108653f5eec5@nvwls.com>

scalp42/chef-client,chef-cookbooks/chef-client,mattray/chef-client,scalp42/chef-client,opscode-cookbooks/chef-client,chef-cookbooks/chef-client,mattray/chef-client,mattray/chef-client,chef-cookbooks/chef-client,opscode-cookbooks/chef-client,opscode-cookbooks/chef-client,scalp42/chef-client