Description of problem:
To be able to run commands that require escalated privileges (sudo), it is currently required to set sudo rule "NOPASSWD" for the SSH user on the target host. (For Red Hat IdM users, the same thing can be achieved with a sudo rule with the sudo option "!authenticate".)

"NOPASSWD" (i.e. passwordless sudo) is not acceptable in all environments and therefore it would be useful to be able to provide a password used for privilege escalation at the remote host.

As a reference, this would be similar to the "--ask-become-pass" option in Ansible.

Version-Release number of selected component (if applicable): 6.2.12


How reproducible: Always


Steps to Reproduce:
1. Setup REx with a user that is not root, e.g. by following https://access.redhat.com/solutions/2650071 
2. Notice that you have to set "test-user ALL=NOPASSWD: ALL" in your sudoers config

Suggested solution:
In the settings for REx (Administer -> Settings -> RemoteExecution) there are currently 3 settings concerning user and privilege escalation:

remote_execution_ssh_user: testuser
remote_execution_effective_user: root
remote_execution_effective_user_method: sudo

My suggestion is to add another setting, e.g:

remote_execution_sudo_password: ***

That password is then used to escalate privileges at the remote host after authenticating with the user specified in "remote_execution_ssh_user".