Add/remove error tables in library initialization/termination, not per context.

Add/remove error tables in library initialization/termination, not per context.
Use only one library initialization scheme, and install the error tables in
only one place.

* krb5_libinit.c (initialized): Variable deleted, all references removed.
(krb5int_lib_init): Initialize error tables here.
(krb5int_initialize_library): Don't do it here.
* error_tables/Makefile.in (STLIBOBJS, OBJS, SRCS): Drop init_ets code.
* krb/init_ctx.c (init_common): Don't call krb5_init_ets.
(krb5_free_context): Don't call krb5_free_ets.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@16388 dc483132-0cff-0310-8789-dd5450dbe970