Add krb5int_cc_user_set_default_name

Add krb5int_cc_user_set_default_name

Set the default credential cache name for all processes for the current
user.  Currently implemented, for windows only, by setting
HKEY_CURRENT_USER\Software\MIT\Kerberos5:ccname to the specified
ccache name.  This will not override the environment variable 'KRB5CCNAME'.
It will override HKEY_LOCAL_MACHINE and 'indirect' registry values.

Signed-off-by: Kevin Wasserman <kevin.wasserman@painless-security.com>
(cherry picked from commit 80097093062822dde3f1140d250023576e52f59c)

ticket: 7199
version_fixed: 1.10.3
status: resolved