Ticket History #6956: Add ccache collection support to tools

* "kdestroy -A" destroys all caches in collection.
* "kinit princ" searches the collection for a matching cache and
overwrites it, or creates a new cache in the collection, if the
type of the default cache is collection-enabled. The chosen cache
also becomes the primary cache for the collection.
* "klist -l" lists (in summary form) the caches in the collection.
* "klist -A" lists the content of all of the caches in the collection.
* "kswitch -c cache" (new command) makes cache the primary cache.
* "kswitch -p princ" makes the cache for princ the primary cache.

https://github.com/krb5/krb5/commit/916555623ea3c0cd8976718f0b989280df9260ce
Commit By: ghudson
Revision: 25157
Changed Files:
U trunk/doc/rst_source/conf.py
U trunk/doc/rst_source/krb_users/user_commands/index.rst
U trunk/doc/rst_source/krb_users/user_commands/kdestroy.rst
U trunk/doc/rst_source/krb_users/user_commands/kinit.rst
U trunk/doc/rst_source/krb_users/user_commands/klist.rst
A trunk/doc/rst_source/krb_users/user_commands/kswitch.rst
U trunk/src/clients/Makefile.in
U trunk/src/clients/kdestroy/kdestroy.M
U trunk/src/clients/kdestroy/kdestroy.c
U trunk/src/clients/kinit/kinit.M
U trunk/src/clients/kinit/kinit.c
U trunk/src/clients/klist/klist.M
U trunk/src/clients/klist/klist.c
A trunk/src/clients/kswitch/
A trunk/src/clients/kswitch/Makefile.in
A trunk/src/clients/kswitch/deps
A trunk/src/clients/kswitch/kswitch.M
A trunk/src/clients/kswitch/kswitch.c
U trunk/src/configure.in
U trunk/src/lib/krb5/ccache/cccursor.c
U trunk/src/tests/Makefile.in
A trunk/src/tests/t_cccol.py
U trunk/src/util/k5test.py
U trunk/src/util/testrealm.py