Fix default recipe and modify default template

[micmicsuarez]

Hi @djoos,

I created a pull request and I am very happy to contribute in this project so that I can help others.

Changes made

Re-implemented the service resource of beanstalkd in the default recipe. I got in error after the execution of kitchen verify that /etc/init.d/beanstalkd does not exists. This is the error log:

Error executing action `enable` on resource 'service[beanstalkd]'
           ================================================================================

           Errno::ENOENT
           -------------
           No such file or directory - /etc/init.d/beanstalkd

I modified the defaultbeanstalkd.erb because I got an error status when I executed systemctl status beanstalkd. This is the error log:

[vagrant@default-centos-72 ~]$ systemctl status beanstalkd
● beanstalkd.service - Beanstalkd Fast Workqueue Service
   Loaded: loaded (/usr/lib/systemd/system/beanstalkd.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since Wed 2016-12-14 16:26:16 UTC; 1min 28s ago
  Process: 12278 ExecStart=/usr/bin/beanstalkd $ADDR $PORT $USER $MAX_JOB_SIZE $BINLOG_DIR $BINLOG_SIZE $BINLOG_FSYNC_PERIOD (code=exited, status=5)

I added flags like -f, -l, -p, and others so that it will work. This is the sample change that I made to default template.

ADDR= -l <% if @opts['l'].nil? %>0.0.0.0<% else %><%= @opts['l'] %><% end %>

I added ChefSpec tests for the beanstalkd default recipe.

Thanks,
Michael