SSSCTL: Move sss_debuglevel to sssctl debug-level
    
    Move code from sss_debuglevel to sssctl_logs.c and add new debug-logs
    sssctl command to perform the same task of changing debug level
    dynamically.
    
    POPT_CONTEXT_KEEP_FIRST Flag added to poptGetContext call in
    sssctl_debug_level() to fix argument parsing.
    
    Resolves:
    https://pagure.io/SSSD/sssd/issue/3057
    
    Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>
    Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
    Reviewed-by: Michal Židek <mzidek@redhat.com>