Add return in check
Handle locked date and time preference pane

If the date and time preference pane is locked, effects are:
1. systemsetup takes 30 seconds to return
    added a 30-second timeout to cmd_exec
2. Unable to change system date and time settings
    added additional check to see if date change was successful
Cleans up timeouts, wait before dropping payload, actually call #cleanup#super to kill the dropped file
Merge pull request #1 from jvennix-r7/locked_pref_panel_dry

Clean up timeout logic and update description
Write the return
Land #2334, @tkrpata and @jvennix-r7's patch for sudo_password_bypass