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Subject: Extend krb5_ccache to support plugable implementations
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The krb5_ccache implementation is very close to a pluggable interface.
It uses a prefix name (API, FILE, MSLSA, etc) as an index into a table 
of function pointers.   By adding a configuration file parameter, sites 
could develop their own ccache implementations without requiring
re-compilation of the krb5 libraries.

Perhaps in krb5.conf a new section:

[krb5_ccache-plugins]
PREFIX1 = library-path1
PREFIX2 = library-path2