Rename the krb5int_buf_ family of functions to use the k5_ prefix for
brevity.  Reformat some k5buf implementation code to match current
practices.

Add k5-int.h static functions to duplicate byte ranges, optionally
with a trailing zero byte, and set an error code like k5alloc does.
Use them where they would shorten existing code.

Read realm parameters directly from the profile in the KDC's
init_realm(), getting rid of the intermediate krb5_realm_params
structure.  Then get rid of krb5_realm_params and
krb5_read_realm_params, since nothing else uses it.

krb5_realm_params is only consumed by the KDC (everything else uses
kadm5_config_params), so only needs to contain fields used by the KDC.
Get rid of everything else.  Also get rid of realm_profile, which is
read in by KDC code but never used (and was never set anyway).

Get rid of K&R-style function headers, format code and comments
consistently according to current conventions, rename some variables
using idiomatic names, and de-indent some nested control blocks.

Remove some unnecessary optimizations to reduce code complexity.  Get
rid of krb5_match_config_pattern in favor of a simpler helper function
in do_tgs_req_c.  Get rid of KRB5_CONF_ASTERISK and just use "*"
instead.  Use a helper function to combine [kdcdefaults] and realm
subsection values of variables, and don't bother adding leading and
trailing spaces.  Consistently use the names "hostbased" and
"no_referral" to refer to variable values (with a "realm_" prefix for
structures which currently use it).

Mostly this gets rid of the trailing space on line 2 after
bb76891f5386526bdf91bc790c614fc9296cb5fa.

kadm5_create_policy and kadm5_modify_policy had _internal variants in
libkadm5srv (but not libkadm5clnt) which only existed to protect the
policy_refcnt field from modification over the wire.  Now that
policy_refcnt is no longer used, we don't need the separation.

Bump the library soname since this is technically an ABI change.

Stop using and maintaining the policy_refcnt field, and do not try to
prevent deletion of a policy which is still referenced by principals.
Instead, allow principals to refer to policy names which do not exist
as policy objects; treat those principals as having no associated
policy.

In the kadmin client, warn if addprinc or modprinc tries to reference
a policy which doesn't exist, since the server will no longer error
out in this case.

ticket: 7385