[Bug 264188] kinit(1) ignore KRB5CCNAME environment if exist /tmp/krb5cc_%{uid}

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264188

            Bug ID: 264188
           Summary: kinit(1) ignore KRB5CCNAME environment if exist
                    /tmp/krb5cc_%{uid}
           Product: Base System
           Version: 12.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: kod1976@gmail.com

Environment KRB5CCNAME specifies the default credentials cache according to
manual page. But it is ignored if file /tmp/krb5cc_%{uid} exist and contain
valid ticket (even expired one) for principal.

For example:

# printenv | grep KRB5CCNAME
# kinit some_principal
# ls -la /tmp/krb5cc_0
-rw-------   1 root  wheel    2071 May 23 16:57 krb5cc_0
# setenv KRB5CCNAME /tmp/krb5cc_test
# kinit some_principal
# ls -la /tmp/krb5cc_test
ls: /tmp/krb5cc_test: No such file or directory
# ls -la /tmp/krb5cc_0
-rw-------  1 root  wheel  2071 May 23 17:00 /tmp/krb5cc_0
# rm /tmp/krb5cc_0
# kinit some_principal
# ls -la /tmp/krb5cc_test
-rw-------  1 root  wheel  2071 May 23 17:03 /tmp/krb5cc_test

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