Security update for accountsservice (moderate)

This update for accountsservice fixes the following issues:

This security issue was fixed:

• CVE-2018-14036: Prevent directory traversal caused by an insufficient
  path check in user_change_icon_file_authorized_cb() (bsc#1099699)

Thsese non-security issues were fixed:

• Don’t abort loading users when an /etc/shadow entry is missing.
  (bsc#1090003)
• When user session type is wayland, act_user_is_logged_in can return TRUE
  if the user is logged in. (bsc#1095918)

This update was imported from the SUSE:SLE-15:Update update project.