Description of problem:
Provision template doesn't assign right file permissions to /etc/sudoers.d/rexuser for non-root users making it unusable. 

How reproducible:
Always

Is this issue a regression from an earlier version:
No

Steps to Reproduce:
1. Generate the curl registration command using `--setup-remote-execution true`
2. Register the Content Host using provided curl command

Actual behavior:
File permissions are invalid:
~~~
[root@pafernan-6158cli ~]# ls -l /etc/sudoers.d/                                       
total 4                                                                               
rw-r-r-. 1 root root 65 Sep 30 17:45 rexuser
~~~

Expected behavior:
File permissions are valid
~~~
[root@pafernan-6158cli ~]# ls -l /etc/sudoers.d/
total 4
r-r----. 1 root root 65 Sep 30 18:27 rexuser
~~~

Business Impact / Additional info:
Remote execution for non-root users doesn't work