FIXES #37867 - remote_execution_ssh_keys sudoers permissions

[pafernanr]

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
-rw-------. 1 root root 65 Sep 30 18:27 rexuser

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

[adamruzicka]

Could you please reword the commit message to be something like Fixes #37867 - Fix remote_execution_ssh_keys sudoers permissions?

[pafernanr]

Sorry, I updated the PR because there were wrong permissions on the first one. 660 instead of 440

[adamruzicka]

Thank you @pafernanr !