KRB5: Move ccache-related functions to krb5_ccache.c
Add a new module krb5_ccache.c that contains all ccache-related
operations. The only user of this module shall be krb5_child.c as the
other modules will run unprivileged and accessing the ccache requires
either privileges of root or the ccache owner.
Reviewed-by: Sumit Bose <email@example.com>
Reviewed-by: Lukáš Slebodník <firstname.lastname@example.org>