Security update for bash (moderate)

This update for bash fixes the following issues:

Security issues fixed:

• CVE-2016-7543: A code execution possibility via SHELLOPTS+PS4 variable
  was fixed (bsc#1001299)
• CVE-2016-0634: Arbitrary code execution via malicious hostname was fixed
  (bsc#1000396)

Non-security issues fixed:

• Fix repeating self-calling of traps due the combination of a
  non-interactive shell, a trap handler for SIGINT, an external process in
  the trap handler, and a SIGINT within the trap after the external
  process runs. (bsc#1086247)

This update was imported from the SUSE:SLE-12-SP2:Update update project.