Printing ldb structures and sysdb_attrs can be a pain. This patch adds a
gdb pretty-printer to help

SSSD and LDB debugging plugins

Activate them by putting:
  source /path/to/this/file.py
to your .gdbinit file

To bypass the pretty printer and print the raw values, use the "/r" option:
  print /r foobar

Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>