Security update for apache2 (moderate)

This update for apache2 fixes the following issues:

Security issues fixed:

• CVE-2016-8743: Fixed liberal whitespace interpretation accepted from
  requests and sent in response lines and headers. Accepting these
  different behaviors represented a security concern when httpd
  participates in any chain of proxies or interacts with back-end
  application servers, either through mod_proxy or using conventional CGI
  mechanisms, and may result in request smuggling, response splitting and
  cache pollution. (bsc#1016715)
• CVE-2016-4975: Fixed possible CRLF injection allowing HTTP response
  splitting attacks for sites which use mod_userdir. This issue was
  mitigated by changes which prohibit CR or LF injection into the
  "Location" or other outbound header key or value. (bsc#1104826)

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