krb5: Improve cccol sub naming; add gss_store_cred_into2()

- Formalize the TYPE:collection_name:subsidiary_name naming scheme for
   ccaches in ccache collections
    - KEYRING: ccaches are weird because they have one more optional field: the
      "anchor", so rather than just assume a naming convention everywhere, we
      add new functions as well
 - Add krb5_cc_{resolve,default}_sub() that allows one to specify a
   "subsidiary" ccache name in a collection separately from the
   collection name
 - Add krb5_cc_{resolve,default}_for() which take a principal name,
   unparse it, and use it as the subsidiary ccache name (with colons
   replaced)
 - Make kinit use the new interfaces
 - Add missing DIR ccache iteration functionality
 - Revamps test_cc
 - Add krb5_cc_get_collection() and krb5_cc_get_subsidiary()
 - Bump the ccops SPI version number
 - Add gss_store_cred_into2()
 - Make MEMORY:anonymous not linked into the global MEMORY ccache
   collection, and uses this for delegated cred handles

TBD:

 - Split this up into a krb5 change and gss mech_krb5 change?
 - Add krb5_cc_init_and_store() utility, per Greg's suggestion?

lib/gssapi/gssapi/gssapi.h

@@ -1187,6 +1187,29 @@ gss_store_cred_into(
     gss_cred_usage_t * /* cred_usage_stored */
     );
 
+GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
+gss_store_cred_into2(
+    OM_uint32 * /* minor_status */,
+    gss_const_cred_id_t /* input_cred_handle */,
+    gss_cred_usage_t /* input_usage */,
+    const gss_OID /* desired_mech */,
+    OM_uint32 /* store_cred_flags */,
+    gss_const_key_value_set_t /* cred_store */,
+    gss_OID_set * /* elements_stored */,
+    gss_cred_usage_t * /* cred_usage_stored */,
+    gss_buffer_set_t * /* env */
+    );
+
+enum gss_store_cred_flags {
+    GSS_C_STORE_CRED_DEFAULT = 1,
+    GSS_C_STORE_CRED_OVERWRITE = 2,
+    GSS_C_STORE_CRED_SET_PROCESS = 4,
+};
+#define GSS_C_STORE_CRED_DEFAULT GSS_C_STORE_CRED_DEFAULT
+#define GSS_C_STORE_CRED_OVERWRITE GSS_C_STORE_CRED_OVERWRITE
+#define GSS_C_STORE_CRED_SET_PROCESS GSS_C_STORE_CRED_SET_PROCESS
+
+
 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_CALLCONV
 gss_set_neg_mechs(
     OM_uint32 * /* minor_status */,