The external_auth tests need to use a unique kerberos credentials cache per test.
See https://web.mit.edu/kerberos/krb5-1.12/doc/basic/ccache_def.html
The external_auth tests need to use a unique kerberos credentials cache per test.
See https://web.mit.edu/kerberos/krb5-1.12/doc/basic/ccache_def.html