Import of code from heimdal

Import of code from heimdal

This commit updates the code imported from heimdal to
42f9c644cf00be752f09d85a9664bf2e3502101c (switch-from-svn-to-git-1962-g42f9c64)

Upstream changes are:

Asanka C. Herath (9):
      Windows: Registry based configuration
      Rename get_entry() -> _krb5_config_get_entry()
      Deal with quoted strings when reading lists of config strings
      Add missing export and calling convention annotations
      Windows: Build and export localtime_r
      Windows: Older Windows SDKs need <winsock2.h>
      More compatibility macros
      Increase KBR5_BUFSIZ to 2048 and use it in config_file.c
      Deal with backslash escaped quotes

Love Hornquist Astrand (3):
      provide symbol renameing for sha512 and sha384
      less exit with failures
      add random abstraction

Change-Id: I495fa8e9c1c037d6dee191279c1155a4ec6be945
Reviewed-on: http://gerrit.openafs.org/3400
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>