s3: rename talloc_sub_advanced() to talloc_sub_full()

s3: rename talloc_sub_advanced() to talloc_sub_full()

We currently have the following substitution functions:

  talloc_sub_basic()
  talloc_sub_advanced()

talloc_sub_basic() currently substitutes a subset of talloc_sub_advanced().

We'll need a function X that only substitutes what talloc_sub_advanced()
substitutes *without* what talloc_sub_basic() does.

To get there rename talloc_sub_advanced() to talloc_sub_full(). A subsequent
commit will then bring back talloc_sub_advanced() as described above.

Examples with fictional replacement letters A and B. Currently:

  talloc_sub_basic:    A
  talloc_sub_advanced: AB

New:

  talloc_sub_basic:    A
  talloc_sub_advanced:  B
  talloc_sub_full:     AB

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13745

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
(backported from commit 4736623c24503b3ca09c76c9dbb134ef833b2f80)