Segfaults in authorization type setting.

[Mats Erik Andersson]

The functions

  shishi_cfg_clientkdcetype_set()

and

  shishi_cfg_authorizationtype_set()

are both throwing segmentation faults every time
they are fed with constant value strings. The reason
is that they both depend on strtok_r() which must
be given writeable strings. Simple calls to xstrdup()
resolve this issue.

As a second matter, both functions always return SHISHI_OK.
This is not reasonable, so a change is implemented that returns
SHISHI_OK whenever at least one valid value was found and set
for the intended configuration entity.

Best regards,

  Mats Erik Andersson

0002-Segfault-in-config-list-parsing.patch
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