Security update for openssh (moderate)

This update for openssh fixes the following issues:

• CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH
  could be used by remote attackers to detect existence of users on a
  target system when GSS2 is in use. OpenSSH developers do not want to
  treat such a username enumeration (or "oracle") as a vulnerability.
  (bsc#1106163)
• CVE-2018-15473: OpenSSH was prone to a user existance oracle
  vulnerability due to not delaying bailout for an invalid authenticating
  user until after the packet containing the request has been fully
  parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.
  (bsc#1105010)

The following non-security issues were fixed:

• Stop leaking File descriptors (bsc#964336)
• sftp-client.c returns wrong error code upon failure (bsc#1091396)
• added pam_keyinit to pam configuration file (bsc#1081947)

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