[rear-devel] [rear/rear] 529285: Update default.conf

[Johannes Meixner]

  Branch: refs/heads/jsmeix-SSH_ROOT_PASSWORD-no-log
  Home:   https://github.com/rear/rear
  Commit: 52928510e6788f683593db095453435131d36bc3
      https://github.com/rear/rear/commit/52928510e6788f683593db095453435131d36bc3
  Author: Johannes Meixner <jsmeix at suse.com>
  Date:   2020-12-11 (Fri, 11 Dec 2020)

  Changed paths:
    M usr/share/rear/conf/default.conf

  Log Message:
  -----------
  Update default.conf

Avoid that the SSH_ROOT_PASSWORD value is shown when usr/sbin/rear was called with 'set -x'.
Set SSH_ROOT_PASSWORD to a default value only if not already set so that the user can set it
e.g. with "export SSH_ROOT_PASSWORD=my_recovery_system_root_password"
before he calls "rear ..." so there is no need to have SSH_ROOT_PASSWORD in local.conf.